He was caught slightly off guard when Lupin grabbed him and shoved him into the doorframe. However, he'd recovered by the time he dared him to do something. "Coward," he said more loudly. And bugger if he was going to use his wand as he curled his hand into a fist and swung it at Remus. It hit with a satisfying crunch and he drew back to strike again, teeth bared. "Fucking coward," he snarled, fist launching toward Lupin's nose.