Looks like their target was at the top of the building, somewhere on the upper levels of the towers. Hate to tell him, they can't kill their target. Their target is still alive. They failed at their mission.

Two can play George's game. Some of us know how to win and survive. I will never forgive him for what he did to me and tried to do to me. He doesn't scare me. 17 years later, I am still here to deliver his judgement message.