It was a rock pick, I'm tellin ya!! Estwing Geo Pick is exactly like the thing in the perp's hand, with the "wing" shape to it.
I'm fairly certain you swing those differently than regular hammers which is why people think the last part of the video was a woman or a wimpy guy without much strength. When you have a pointed end, you don't need to hit the window the same way. It also explains why the glass was coming back towards the perp AND why they weren't sure which way certain windows were broken out, because glass fell on both sides of the door.
Geo pick.