The servant had a death wish, especially for interrupting their conversation. But he was just following the orders of Lady Malith, who heard about the emperor dining in with Emelia.
When Lady Malith heard the emperor inviting Emelia to dine with him, she got jealous and had to invite herself in. Either way, if Elliot pushes her away, he can't do anything because Lady Malith is a persistent, annoying girl.
"Don't make me repeat twice who?" Elliot asked in a low tone, sending chills behind the servant's back. The servant looked too scared to answer, but he did answer while stuttering. The servant answered, "L-lady Malith. She said to add a plate for her."
Elliot didn't look amused at all. Rather it annoyed him all the more. He stood up from his chair, and the servant stepped back and didn't dare to meet Elliot's eyes. The servant was too frightened to the point he looked at Air, begging to help him.