Activision has released a new video for Prototype 2 which demonstrates the new Pack leader ability Heller can perform in the game. How it works, is he calls upon infected Brawlers and forces them to fight for him. Once summoned, Heller directs his these new allies to destroy tanks, helicopters other enemies, or whatever he needs them to do. They will follow his orders despite the danger to themselves. You can see how this works out for yourself below. Prototype 2 is out next week on PS3 and Xbox 360. The PC version releases in July.