Ok im on the train and up to the boss guy with the kryll. how the hell do i beat this dude? i have somewhat of an idea where u have to wait until the kryll are off him to attack, and you can throw grenades to get them off him. the only problem is that @$$ dom gets killed in like 2 secs then the boss is chasing me the whole time. and i have lasted a while and kept blasting him a few times and he still wont go down. is there an alternate way to beat him? i.e. knock him off train or something? the game has been fairly easy for me up to this point.