[His arm is still bleeding, Sebastian notes with some faint irritation - but, being Sebastian, he just puts that aside for now, ignoring the pain (and ignoring how much it hurts despite being a mere flesh injury).
Instead he gives the monster an experimental, hard kick in its head (you're a lovely person, Sebastian) to verify it's truly dead. Keeping an eye on Porthos all the while out of the periphery of his vision-- not warily, but rather evaluating. He wouldn't expect a fellow supernatural creature to fake confusion after being found out, so...]
Your bare hands make for efficient weapons, Mr du Vallon.