A good time to remind everybody that while rubber bullets are considered "non-lethal," they can kill.
Back in 2004 a college student in Boston died from a bullet that missed its intended target, hit the ground and ricocheted into her eye.
https://en.wikipedia.org/wiki/Killing_of_Victoria_Snelgrove
So, while the shot certainly wasn't warranted, IMO its worse because of what could have happened because this officer was taking a shot for fun.