diff --git a/engine/class_modules/sc_rogue.cpp b/engine/class_modules/sc_rogue.cpp
index c53d0facd8b..acc4201a91f 100644
--- a/engine/class_modules/sc_rogue.cpp
+++ b/engine/class_modules/sc_rogue.cpp
@@ -2628,6 +2628,9 @@ class rogue_action_t : public Base
   virtual double composite_poison_flat_modifier( const action_state_t* ) const
   { return 0.0; }
 
+  double cost_flat_modifier() const override
+  { return ab::cost_flat_modifier(); }
+
   double cost_pct_multiplier() const override
   {
     double c = ab::cost_pct_multiplier();
@@ -3926,17 +3929,6 @@ struct blade_flurry_t : public rogue_attack_t
       return m;
     }
 
-    void impact( action_state_t* state ) override
-    {
-      rogue_attack_t::impact( state );
-
-      // 2026-04-10 -- Whirl of Blades is triggered by Blade Flurry cast damage only with Deft talented
-      if ( p()->bugs && p()->talent.outlaw.deft_maneuvers->ok() ) 
-      {
-        p()->buffs.mid1_outlaw_4pc->trigger();
-      }
-    }
-
     bool procs_main_gauche() const override
     { return true; }
   };
@@ -3990,6 +3982,19 @@ struct blade_flurry_t : public rogue_attack_t
     }
   }
 
+  double cost_flat_modifier() const override
+  {
+    double c = rogue_attack_t::cost_flat_modifier();
+
+    if ( p()->talent.outlaw.deft_maneuvers->ok() )
+    {
+      c += std::min( instant_attack->target_list().size() * p()->talent.outlaw.deft_maneuvers->effectN( 3 ).base_value(), 
+                                                            p()->talent.outlaw.deft_maneuvers->effectN( 4 ).base_value() );
+    }
+
+    return c;
+  }
+
   bool breaks_stealth() const override
   { return false; }
 };