In my script, I want to write it so that these crooks are committing a heist, and a bystander happens to be in the wrong place at the wrong time. They go after him and search the premises for him. He manages to kill one of them and since the crooks are wearing masks, he switches clothes with the dead one, and puts on his mask. He then maims the dead guys face, so he cannot be recognized by the others. The others think that their comrad has now killed the bystander, as soon as they see their comrad in the bystander's clothes, with his face maimed. The bystander, wearing the comrad's clothes, then has to disguise his voice by coughing, in order to come up with something to fool them and escape. However, is this believable, that they would believe that the bystander is their friend, just because the clothes were switched, as well as putting on the mask, and vice versa, for the dead man? I mean Silence of the Lambs, had a similar scenario, so I am wondering if mine is pushing it too far, but what do you think?