"You could just invite them?" he's very confused about why the more passive method, but then he doesn't have any insights into the monster to human relationship of this unnamed world. Maybe he's ended up asking a stupid question after all.

"Well, uh--" he bumbles forward and out of the uncertain waters, "Thank you, for the welcome."

It's really not the kind of situation where he would have expected it and it's almost as unnerving as a person with no flesh.