After P'Li died, Zaheer no longer had anything tying him to this world. That's why he was able to fly. Pretty sad stuff.
Make this a real game!
I can't help but feel this display of emotion and blatant disobedience will become important later on.
They so tricked me into thinking this was going to be a bad guy with a greater calling, someone who had a real purpose beyond furthering himself and all that typical crap. But NOOOOOOO
HE WAS NUMBER 1!