Since we are talking Marvel, I was watching X-Men Origins: Wolverine the other night and it got me thinking. So in the end we kind of find out that Wolverine could be killed if you chopped his head off.
So then why at the beginning of the movie when they are facing a firing squad and they don't die, wouldn't someone be like hey lets chop these motherfuckers heads off. I mean... it totally ruined the movie for me I hate when stories don't have that realistic continuity.