I’ve been a soldier, a National Guardsman, and a State Guard member. I’ve had riot control training and been through five riots, at least.
Folks have asked, “Would American Troops fire on American citizens?” Tossing a brick or iron pipe off a rooftop is the kind of behavior that would make me say ‘yes, I would!’
“Tossing a brick off a rooftop” could result in some real damage and/or injury, should be considered intent to do seriously bodily harm or even murder.