Severus was exhausted and annoyed. He had been searching for the horcrux in the room of requirement for an entire year, but Lucius pointed out that he should use the house elves to find the thing, he was ready to slam his head on the next wall, when Lucius gave him this idea. Why didn’t he think about it earlier? Lucius and Narcissa wanted to laugh at his antics, but remained silent. He just gave his famous glare that he gave his students, when they were not carefully enough in his potion class, towards them.