He feels an open summons and lets it grab him -
"Holy shit, wow, calm down," says Cam, holding up his hands in a placating gesture. "I think this is an alternate universe from my usual one. I'm pretty typically shaped for a demon from mine."
"What, do you want me to saw my wings off? Would that make it better?" exclaims Cam. "What do you want?"
"He summoned me!" Cam exclaims, pointing at Darren. "I thought I was going to spend an afternoon making a dome for a city on Mars or something, and instead I'm a hundred and fifty years in the past in my fucking hometown in an alternate universe where there are perytons!"
He explains.
"S-So he's not - please don't stab him?" he finishes.
"And demons from my world have a bad reputation too, but at least there the fact that my summoner is obviously conscious and unharmed would constitute evidence that I am not up to whatever has you so riled."
"Well, that was impolite, does she barge into your house and threaten your visitors routinely?"
"She's got a thing about demons. Should have warned you, sorry. Wouldn't have attacked without being sure, though."
"Sure of what exactly? Because I am literally a demon according to my own world's definition. I am a demon and I do demon magic and I live in Hell."