diff --git a/lib/trailblazer/macro/strategy.rb b/lib/trailblazer/macro/strategy.rb
index c7dcd1a..91db54c 100644
--- a/lib/trailblazer/macro/strategy.rb
+++ b/lib/trailblazer/macro/strategy.rb
@@ -4,7 +4,7 @@ module Macro
     class Strategy # We want to look like a real {Linear::Strategy}.
       class << self
         extend Forwardable
-        def_delegators :block_activity, :step, :pass, :fail, :Subprocess # TODO: add all DSL::Helper
+        def_delegators :block_activity, :step, :pass, :fail, :left, :Subprocess # TODO: add all DSL::Helper
       end
 
       # This makes {Wrap} look like {block_activity}.
diff --git a/test/docs/autogenerated/operation_each_test.rb b/test/docs/autogenerated/operation_each_test.rb
index 4a4c211..62d4490 100644
--- a/test/docs/autogenerated/operation_each_test.rb
+++ b/test/docs/autogenerated/operation_each_test.rb
@@ -4,7 +4,7 @@
 
 # step Macro::Each(:report_templates, key: :report_template) {
 #   step Subprocess(ReportTemplate::Update), input: :input_report_template
-#   fail :set_report_template_errors
+#   left :set_report_template_errors
 # }
 
 # def report_templates(ctx, **)      ctx["result.contract.default"].report_templates
diff --git a/test/docs/each_test.rb b/test/docs/each_test.rb
index ffb68df..c658793 100644
--- a/test/docs/each_test.rb
+++ b/test/docs/each_test.rb
@@ -3,7 +3,7 @@
 
 # step Macro::Each(:report_templates, key: :report_template) {
 #   step Subprocess(ReportTemplate::Update), input: :input_report_template
-#   fail :set_report_template_errors
+#   left :set_report_template_errors
 # }
 
 # def report_templates(ctx, **)      ctx["result.contract.default"].report_templates
diff --git a/test/docs/rescue_test.rb b/test/docs/rescue_test.rb
index 4ab7a12..b3b4cb0 100644
--- a/test/docs/rescue_test.rb
+++ b/test/docs/rescue_test.rb
@@ -17,10 +17,10 @@ class NestedInsanity < Trailblazer::Operation
       step ->(options, **) { options["b"] = true }
       pass ->(options, **) { raise A if options["raise-a"] }
       step ->(options, **) { options["c"] = true }
-      fail ->(options, **) { options["inner-err"] = true }
+      left ->(options, **) { options["inner-err"] = true }
     }
     step ->(options, **) { options["e"] = true }, id: "nested/e"
-    fail ->(options, **) { options["outer-err"] = true }, id: "nested/failure"
+    left ->(options, **) { options["outer-err"] = true }, id: "nested/failure"
   end
 
   it { assert_match /\[>Rescue\/.{1,3},>nested/, Trailblazer::Developer.railway(NestedInsanity)  } # FIXME: better introspect tests for all id-generating macros.
@@ -54,7 +54,7 @@ class Song::Activity::Create < Trailblazer::Activity::Railway
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
       #~methods
       include T.def_steps(:create_model, :upload, :notify, :log_error)
       include Rehash
@@ -91,7 +91,7 @@ class Song::Activity::Create < Trailblazer::Activity::Railway
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
       #~methods
       include T.def_steps(:create_model, :upload, :notify, :log_error)
       include Rehash
@@ -125,7 +125,7 @@ class Memo::Create < Trailblazer::Operation
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
       include T.def_steps(:find_model, :update, :notify, :log_error)
       include Rehash
     end
@@ -148,7 +148,7 @@ class Memo::Create < Trailblazer::Operation
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
       #~methods
       include T.def_steps(:find_model, :update, :notify, :log_error)
       include Rehash
@@ -180,7 +180,7 @@ class Memo::Create < Trailblazer::Operation
       step :find_model
       step Rescue(&rescue_block), fail_fast: true
       step :notify
-      fail :log_error
+      left :log_error
       #~methods
       include T.def_steps(:find_model, :update, :notify, :log_error, :rehash)
     end
diff --git a/test/docs/wrap_test.rb b/test/docs/wrap_test.rb
index 86be888..85f3f73 100644
--- a/test/docs/wrap_test.rb
+++ b/test/docs/wrap_test.rb
@@ -26,7 +26,7 @@ class Upload < Trailblazer::Activity::FastTrack
         step :transfer # this might even break!
       }
       step :notify
-      fail :log_error
+      left :log_error
       #~meths
       include T.def_steps(:model, :update, :transfer, :notify, :log_error)
       #~meths end
@@ -63,7 +63,7 @@ class Upload < Trailblazer::Activity::FastTrack
         Output(:timeout) => Track(:fail_fast) # any wiring is possible here.
       #:out end
       step :notify
-      fail :log_error
+      left :log_error
       #~meths
       include T.def_steps(:model, :update, :transfer, :notify, :log_error)
       #~meths end
@@ -109,7 +109,7 @@ class Upload < Trailblazer::Activity::FastTrack
         step :transfer # might raise an exception.
       }
       step :notify
-      fail :log_error
+      left :log_error
       #~meths
       include T.def_steps(:model, :update, :transfer, :notify, :log_error)
       def transfer(ctx, seq:, transfer: true, **)
@@ -157,7 +157,7 @@ class Memo::Create < Trailblazer::Operation
       step :rehash
     }
     step :notify
-    fail :log_error
+    left :log_error
     #~methods
     include T.def_steps(:model, :update, :notify, :log_error)
     include Rehash
@@ -196,7 +196,7 @@ def self.call((ctx), *, &block)
         step :rehash
       }, fail_fast: true
       step :notify
-      fail :log_error
+      left :log_error
 
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
@@ -233,7 +233,7 @@ class Memo::Create < Trailblazer::Operation
         step :rehash
       }, fast_track: true
       step :notify
-      fail :log_error
+      left :log_error
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
       include Rehash
@@ -274,7 +274,7 @@ class Memo::Create < Trailblazer::Operation
         Output(:success) => End(:transaction_worked),
         Output(MyTransaction::MyFailSignal, :failure) => End(:transaction_failed)
       step :notify
-      fail :log_error
+      left :log_error
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
       include Rehash
@@ -319,7 +319,7 @@ def self.call((ctx), *, &block)
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
 
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
@@ -354,7 +354,7 @@ def self.call((ctx), *, &block)
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
 
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
@@ -393,7 +393,7 @@ def self.call((ctx), *, &block)
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
 
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
@@ -432,7 +432,7 @@ def self.call((ctx), *, &block)
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
 
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
@@ -480,7 +480,7 @@ class Memo::Create < Trailblazer::Operation
         step :rehash
       }
       step :notify
-      fail :log_error
+      left :log_error
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
       include Rehash
@@ -521,7 +521,7 @@ class Memo::Create < Trailblazer::Operation
         step :update
       }, fast_track: true # because Wrap can return pass_fast! now
       step :notify
-      fail :log_error
+      left :log_error
       #~methods
       include T.def_steps(:model, :update, :notify, :log_error)
       #~methods end
@@ -554,7 +554,7 @@ class Upload < Trailblazer::Activity::FastTrack
         },
           Output(:timeout__) => Track(:fail_fast)
         step :upload
-        fail :log_error
+        left :log_error
         #~methods
         include T.def_steps(:model, :send_request, :upload, :log_error)
         #~methods end