Grand Theft Auto IV Walkthrough

Dimitri will make a getaway on his helicopter, and while Niko grabs on momentarily, he's shortly thereafter kicked into the water below. Thankfully, he lands not on top of, but rather next to a speedboat that he can pull himself into in order to give chase. Stupidly, Dimitri's pilot keeps a course that remains over water for some time, so he's easy to follow (and, as usual, the helicopter will also show up as a red dot on your HUD). They will shoot RPGs at you en route, but they can't hit you, so worry not about those. Instead, worry about keeping a consistent speed, because Little Jacob will swoop in to save you and you'll have to get under his helicopter before it's too late (you would have received a text alluding to this earlier in the mission).

If you made it to Little Jacob's helicopter on time, then you will have grabbed on automatically. Follow the on-screen prompt to lift Niko into the safety of the helicopter. Once you do that, you'll be able to pilot the craft. The game will tell you to keep it low, but that's not really necessary. Instead, just concentrate on staying on Dimitri's helicopter as it twists and turns throughout the city. That's the only thing that's important. Eventually (and automatically), Little Jacob will take down Dimitri's helicopter, but you aren't immune either. Instead, you and Little Jacob crash, too. Where? How about on Happiness Island, in between Algonquin and Alderney.

From here, victory is within your grasp. Niko will once again insist that Little Jacob stays behind as he pursues the foe (yet again represented as a red dot on your HUD). En route, some of Dimitri's remaining allies will stand in your way with assault rifles, trying to gun you down. Shoot them as you run, but don't pay them too much mind—it's important that you keep up with Dimitri as he circles the base of the Statue of Happiness. Once you catch up with him, shoot him and the game will take over. We won't ruin it for you, but nonetheless you've beaten one branch of the game. Congratulations! Hopefully, you made an alternate save so you can play through the "Revenge" chain of final missions instead, to see what you missed!