As he would witness the Alien's reaction to his appearance it would seem to Startle him and either out of a reaction or from his training, he would act without thinking, Managing in a Split second to upholster his pistol and start to aim it at him, his face was once that of Surprise and bemusement, now became that of aggression and Hostility, however before he could do anything it would seem his mind would take back control of his body, and he would begin to lower the Pistol.
Breathing hard, as he were to speak, his voice now in a state of shock as he were to finally speak; "you Startle me again.. and I might blow your head of... Jesus, at least warn me first before you start to explode like that.. And for your Information, what the hell is a "Human" if your referring to my Species, were called "Narrati"