He's taken to using the dungeon whenever his business is nobody else's. Most employees quickly learn not to barge in. It should be obvious why that is a bad idea, but a lot of the babyvamps have clearly been made by lax and neglectful vampires, who've failed to tell them that not pissing off someone like Eric is a good idea.
And their humans parents have clearly never taught them anything useful either.

He is down there, pacing, his short red silk robe practically billowing every time he turns.
His call hadn't been picked up the first two times.

That alone would make him furious.

But finally there's an answer. And as Pam enters she will see him listen, one finger resting against his blue tooth headset.

His posture is tense, the seething anger visible in the set of his shoulders.