Hank could hear and smell his visitors before Ororo spoke. He had recognized her scent, but the one with her was foreign to him and smelled of guns and death.
Kitty was on one of the beds in the medical office. He had her connected to monitoring equipment already, and had an IV connected. He had been able to neutralize the poison in relatively short order. He may not actually be an MD, but he was blessed with having access to some very advanced equipment.
"I'm in Medical, Ororo" He called out to her. He moved between his patient and the door. If this second person was a threat he could at least give Kitty some Cover