Act III - Endgame Call of Duty: MW2 Guide

Quickly go down to the dinghy #1. Start chasing Shepherd and don't let him get away. Move forward with [W] (default). You can also reverse with [S] (default). From time to time you will have to fight off some enemy reinforcements using the semiautomatic pistol #2.

After getting out, a chopper will appear #1. Listen to Price's advices, quickly turn right or left when it's needed. At some point the river will get sharper and afterwards Shepherd will jump into his chopper. Keep a steady course so that the captain can take a shot #2.

You won't be able to avoid the waterfall. After a while you will wake up, dazed. Head towards the wreck to finish off your target. On your way you will come across a crawling enemy and afterwards another one, who will be trying to get his pistol - be quicker and stab him with the knife #1. Follow Shepherd and attack him once he stops by the car #2.

After waking up once more, Price will save your life. After a short struggle, begin to crawl towards the pistol on the ground #1, by using the left and right mouse buttons alternately. In the end your last resort will be the knife in you chest. Keep pressing [F] to get it out. Aim at Shepherd and throw the knife #2.