Someone is definitely moving around in the house now, judging by the shadows. It could be normal indoor activity, or it could be them getting ready to come out and check... What's taking Alice this long? He turns back to the pen.

Oh. Well, that would do it.

He briefly wonders if he has time to get his bow out and shoot the thing, but no, it'll take too long. (Maybe he should learn to throw knives after this.) There is a quick solution here, though.

"Drop the sack!"