The slam takes Lyall rather by surprise, and he blinks at the door a few times before gathering his wits back together. "Well!" He frowns at the door, bares his teeth a little in rather useless defiance to the utter rudeness-- to anyone passing by, they even go briefly sharp-- before turning away and going on his way.

Not worth it. Any kind of confrontation will turn into a challenge, and that... simply isn't worth it.