Demetrius grumbled about the tunnel being much to short for him. While the older Death Eaters were taking down the wards, he had an encounter with Hagrid which he successfully WON. He wasn't so lucky a bit later when he proved that he's basically Corbina's bitch, relenting after a short argument and letting her go fight. Narcissa then yelled at him for it and he moped for the rest of the night.