Subway shooting oddities

Why the smoke? Why all the leg shots? And, mercifully, no deaths. Horrific attack, but here is footage immediately after. What is the woman doing at the 49 second mark at the bottom right? Something very strange about the behavior of these people stumbling out.

GRAPHIC

https://twitter.com/alexstein99/status/1513902474285002757?s=21&t=uGBJ_Yvk1jKEloinfKAzJw

Author: S. Smith