He still had needed a moment to regain his balance. Jumping out of a chair with feet on a desk wasn't exactly easy. Yes, Sirius liked to consider himself ready at any moment, including then, and he had proven it. But that didn't make it fun or any less difficult. And his mood was still foul. Physical difficulty didn't matter at all when he was in a good mood.
"He's fucking pissed off at me," Sirius replied, crouching down to pick up his journal. He threw it across the way at Remus. "Fuck if I know why," he began pacing, "And don't give me a look. I didn't do anything. If you think so, though, at least have the fucking courtesy to tell me what." He made a motion toward the journal. "Lily's entry," he gave as a reference.