How do you defeat wesker on Resident Evil 5 at the volcano

Don't you just hate answers like this? Anyways, If your Chris, run till you fall down. When you fall, keep shooting him. Have Sheva shoot him too. When he go's after Sheva, shoot him so he's to busy with you. When you are done with that, run to the boulder and push it down. Meet Sheva on the little raised part of your section to begin the next section of your fight. There is a checkpoint here. Now die and restock on first aid sprays if you need them. Keep blasting him and go in and stab him. Congrats! The ending has a button pressing section though. which are L1-R1 or square,X