As soon as the hexes began flying, Argus' mind snapped into action. He knew Rodolphus and Greyback would take care of their own skins. Now was the time to take care of himself. No longer bored and languid, he threw his arm forward as a body-bind curse whizzed past his ear, only just missing him. Still it had been enough to interrupt him mid-hex.
He spun out of the way, his second attempt at the exploding curse more successful this time. "Expulso!"
The curse hit a heavy-looking oak table in the middle of the floor, causing it to shatter with a shriek of rending wood. Argus could feel the force of it even from where he was standing across the room. He didn't have any explicit intentions of killing anyone, at least not Potter. Besides, he knew his two companions were much more amenable to that sort of work. Why deprive them?