Add one last murder check

MiraAPI/Networking/CustomMurderRpc.cs

@@ -79,6 +79,10 @@ public static class CustomMurderRpc
         bool showKillAnim = true,
         bool playKillSound = true)
     {
+        if (LobbyBehaviour.Instance)
+        {
+            return;
+        }
         var murderResultFlags = didSucceed ? MurderResultFlags.Succeeded : MurderResultFlags.FailedError;
 
         var beforeMurderEvent = new BeforeMurderEvent(source, target, inMeeting);