I heard the wife of the guy that shot the movie claim she was in the suit and wanted him to hurry up because she was worried someone would shoot her.
Hadn't heard that, although there are plenty of hoax theories out there.
If that was a chick in that "suit", she did a wicked good impression of an 800lb 7ft biped with a thick neck. The stride/gait alone is astounding to watch.
Plenty have tried and failed to fake that sequence, without much success.