If you have trouble with the last boss,be on one player first of all and then,use gernade launcher with flash rounds near the boulder.then before the flash rounds move the boulder!!! then shoot weskar with all flash rounds,save the rest of you amo!!!then when he goes after sheva,use all the amo you have! then she will hop across the boulder and you will be reunited and if you cant get across the boulder your not supposed to.onley sheva can.afterwords hit wescars weak spot with a stun rod because they work the best or a knive if you dont have one.hit the heart alot and then hit the heart in his chest hurry because if you dont the heart will be in his back again.when wescar is weary you have a split second to restrain him from behind while sheva/chris stabs him alot in movie mode but in movie mode you have to press buttons so be quick and the person restraining has to keep it up or you have to do all over again.then wescar goes in lava you go in a helecopter and get rpg's because wescar grabs the helacopter in atempt to kill chris and keep pulling both triggers untill he dies when you get the rpgs.thank you for reading the walkthrough i hope it helps you all.