The rat steps back as Thorg crouches down, but stops and watches him. When he presents it with his vestments, it hesitates, steps forward a bit, and sniffs. Slowly it moves forward and sniffs again, then climbs up onto the proferred clothing and from there to Thorg's hand. It begins exploring his arm curiously, moving up and down.
The doors, upon closer investigation, are surprisingly smooth, and Carolina would guess they're about four feet across by nine feet high. There's a slight indentation at eye level to the halfling on each of the doors, and combined with the lack of hinges on this side of the door it suggests that the doors, if pushed, would open inward. Given the size of the giant outside, it's likely he could not have fit through the doorway without substantial discomfort -- in fact, he may have had difficulty even travelling down the tunnel that led them here.
While the others are examining the door or speaking to the rat, Aswan notices that dirty water is slowly starting to trickle into the room from the hallway.