[Door]

(Oops, completely missed this. My bad. )

The ferret makes ferret-y noises at Thernardier.

It is, after all, a ferret.

As Thernardier walks in, the ferret shuts the door (somehow) and follows him.

It's worth noting that if Thernardier has any sort of bug, spy camera, or any similar equipment that could be used to spy on AMEN, the ferret will attack it.