Bruce follows, because meeting the rats is probably a good idea.

He ends up staring. A lot.

'I've been Bound for months, and that is, without question, the weirdest thing I've seen yet.'

A moment later, the bathroom door opens. Javert is still dressed, and is holding one of the rats at arm's length, by the scruff of its neck. Guppy is getting the full force of his glare, as if the creature is some sort of personal affront.