Rudy hadn't quite expected to find himself falling too, but fall he did, bringing his left hand out to catch hold of Sirius' jacket in effort to keep himself on top, with little avail and falling a bit more to the side instead. The sting of his palms and knees hitting pavement was gone in moments, his focus kept intently on Sirius.

He was snarling now, his eyes blazing with hatred and rage. He took hold of his fallen knife again and lunged at Sirius, knife in hand and his free hand reaching for Sirius' neck.