I read it as they would shoot the bricks like clay pigeons. Not sure if you know, but shooting clay pigeons is quite a sport in some parts of the US.
This is an extreme response to the extremism/marxism we have seen in the past few weeks.
Unfortunately our politicians have let the leftist extremists have their way too long and are triggering this backlash.
I think most Americans wish for peace. The leftists should go back to moms basement, the right wingers should go back to work, the police need to reform their tactics, and the courts need to hold them responsible.
But the leftists continue their attack on America, and that will bring about more right-wing extremism. If this continues down this path, then Americans will have to choose between the two.