[Oh yes he does! Prefect has absolutely no intention of swerving away from his route to the door, however, this absence of intention is somewhat compromised when he feels Jim's hand suddenly gripping his arm.]

Get off me!

[He chokes the words out in a sudden burst of shock, jerking his arm back and away from Jim with a sudden and abrupt motion. Okay, so he shouldn't really be surprised that the Captain grabbed him, but Prefect can't help it. He doesn't like being grabbed.]