With Erik's supernatural hearing, he may well be able to overhear the heavy, annoyed sigh Tarantulas lets out when he recognizes Erik's voice. And the way he drops his tools onto the table. And his heavy, clipped footsteps, nearly stomping as he reaches the door...

The point being, if Erik is paying attention he should very much know Tarantulas has not cooled off, even before he opens the door to better glare at Erik.

"Well?" he says curtly, leaning against the doorframe with arms and extra legs both crossed over his chest. "What could we possibly have to talk about?"