diff --git a/CInterface/Battling/BattleParty.cpp b/CInterface/Battling/BattleParty.cpp
index dd40f29..e402dfc 100644
--- a/CInterface/Battling/BattleParty.cpp
+++ b/CInterface/Battling/BattleParty.cpp
@@ -19,3 +19,9 @@ export uint8_t CreatureLib_BattleParty_IsResponsibleForIndex(bool& out, const Ba
 }
 
 export bool CreatureLib_BattleParty_HasCreaturesNotInField(const BattleParty* p) { return p->HasCreaturesNotInField(); }
+
+inline bool BattleParty::IsResponsibleForIndex(uint8_t side, uint8_t index) const {
+    return std::any_of(_responsibleIndices.begin(), _responsibleIndices.end(), [side, index](const CreatureIndex& ci) {
+        return ci.GetSideIndex() == side && ci.GetCreatureIndex() == index;
+    });
+}
diff --git a/src/Battling/Models/BattleParty.hpp b/src/Battling/Models/BattleParty.hpp
index 8b84e62..e9033c9 100644
--- a/src/Battling/Models/BattleParty.hpp
+++ b/src/Battling/Models/BattleParty.hpp
@@ -24,13 +24,7 @@ namespace CreatureLib::Battling {
             return _responsibleIndices.Contains(index);
         }
 
-        inline bool IsResponsibleForIndex(uint8_t side, uint8_t index) const {
-            for (const auto& i : _responsibleIndices) {
-                if (i.GetSideIndex() == side && i.GetCreatureIndex() == index)
-                    return true;
-            }
-            return false;
-        }
+        bool IsResponsibleForIndex(uint8_t side, uint8_t index) const;
 
         inline bool HasCreaturesNotInField() const {
             auto& p = _party->GetParty();