SPOILERS ALERT...

… Couldn't he at one point or at some point do and at least TRY to do more in order to escape from them or confront them? Especially, SPOILERS, when at one point Tim Roth's character even manages to fall asleep with a gun on his chest or so?

And at the end, all he does is run, but slowly and in a very straight line?

Also, for all his talks of knowing they'd find him sooner or later (but maybe STILL try to hide or get plastic surgery), why does he actually struggle and FIGHT at the beginning when those Spanish kids invade his house and kidnap him, did he think it was a random robbery?