-He approaches her silently with his revolver and gas leaking into the room and shoots the weapon out of her hand-
"Hands..tshhhh...Up"
(Note the tshhh is him breathing with the gas mask)
"Wait...tshhh...who....."
-You see him pull of the gas mask once he noticed the air was gone to reveal a human male-
"That's better and I would like to examine these bodies to make sure my explosives didn't kill them"