How do you beat Wesker in Resident Evil 5

befor u go acros the bridge of rocs that braics and shoot it then it braics befor u fall then u go in circles on the litle island and shoot him in the bac antil he goes after your team mate u shoot him til she gets to the end tnen u hit the rock so she gets acros then shoot him til he gets angry and jumps into the midle of the island then u shoot iim in the back then dekalls into the lava then u get in a helicopter then he grabs the heli copter so u get some rocet lornchers from the helicopter and shoot him then he dies ;)