first complete the game as quickly as possible don't fight the nemesis just
RUN for the exit once you have completed it you will get an epilogue two or
three costume and more importantly the mercenaries game then use mihail to
get unilimted ammo assault rifle and the rocket launcher.now have some fun
and just work your way through with that lot you can kill the nemesis in two
hits (anyone of his mutations apart from the last one!!!!) then it will tak
time but it will be extremly easy.