[sumthinprofound]

Anytime I have brought colleagues in to interview a candidate, during the introduction, I'll note that "Bob from devops will be joining us, but he may get called away" based on the circumstances however I would not appreciate a coworker stepping out without an explanation for the candidate as that would reflect horribly on the organization in my opinion.

[b3morales]

We'd also expect Bob to say something like "Oh crap excuse me, sorry, the server's on fire" as he leaves.

[sumthinprofound]

Absolutely!