premise: Pause again . Tch , tch - tch , tch . As another crash of thunder rolled overhead the door creaked open , revealing the face of Remus Lupin peering cautiously round , a tea towel dangling from one hand . He looked down at the soggy dog and frowned . He dropped the tea towel on the dog 's head then hurried off down the hall and reappeared moments later with a large blue bath towel , which he handed to the gaunt man now dripping on his hall carpet . Why did Remus Lupin hand a bath towel to the gaunt man ?
hypothesis: Because another crash of thunder rolled overhead .