"Oh, yes. Sensing vibes and bending spoons and talking with the mind. We didn't have any mystics back home, but there were some witches."

Arthur has a 1960s English view of psychic phenomena, only with the added bonus of coming from a place with aliens, witches, ghosts, and a whole host of other strange things. He accepts the explanation without question. If a talking yam could cast a spell on him to give him the digestive abilities of a scavenger animal, then his queue friend can certainly have psychic powers.

It's not by far the strangest thing he's encountered. Besides, why doubt him? He sounds perfectly rational and level headed. Arthur knows what madmen sound like.

"Oh, but I'm not very good at distractions. Things tend to...er...explode."

Whether intended to or not.