In another life he would have been impressed at his opponents quick thinking. In that life he might have also listened to what Sirius was trying to say, that life was long gone though.

The weapon that he is now does not hesitate, charging for where the other man now stands and drawing back his right human hand for a solid punch at Sirius' jaw. While that's happening the metal one goes to the back of his trousers, pulling out the twisted piece of scrap metal he'd taken to using as a knife and palming it for future use.

There's no intention for this fight to last any longer than it has to.

If killing everyone else was the only way out then that was what he'd do. Then he would find out who was now thinking to hold his leash.