"Woah, hey." Holy shit. He gestures wide, not quite a handflap, but definitely something he tries to make look placating.

"I've never seen--someone like you." As far as aliens go, he's met Thor, a member of his superhero squad the Avengers; and who looks like any other earth-human even if he's anything but. "I'm sorry. I didn't mean anything by it, man."

He even comes right over to Lantar and offers him his hand to shake in greeting. Hopefully it's a universal greeting and isn't construed as a threat oh my god. "I'm Sam." He's still a bit shaken, but is clearly trying to make up for the offense he's caused.