Harry jumped up and shouted when Sirius slammed his fist into the wall. Harry was kind of freaked out by that. His grown up godfather had never gotten that angry in front of him. Of course, his grown up godfather had Remus to help calm him down.
"Woah!" Harry said holding his hand up. He walked around to the other side of Sirius so he could get a look at the wall and his hand. He tried to see how Sirius's hand was, but the bastard kept moving.
"Listen, mate. I get that you're angry about it. But punching walls, isn't going to help."