Sirius spun around just in time to watch Harry, who’d pulled himself to standing against a tree stump. Harry hesitated for a moment, then took one, two, three steps right toward the mud. He walked like a bowlegged drunkard on slippery ice, and seemed to catch himself by surprise at how far he’d gotten on his new feet. He looked around, bewildered, searching for Sirius, just as his knees started to buckle underneath him. Sirius started to move, but Remus was closer. He jumped up and leapt across the grass, catching Harry just before he tumbled face first into the mud puddle.