Search Results: no response to phone calls

So a couple of days ago I called the boss, who had taken the day off, to clarify something he had given me as a task. Now the boss & I generally have a good rapport as it is so he had no problems with me phoning him (most others text him for his leisure to respond). Anyway as I am talking to him the colleague from nearby calls out X I want to talk with him (the boss) too.

So I wrap up my conversation with the boss and tell him that the colleague wants to talk to him, let me put you on hold. I do so, tell her what line, and about 30 minutes later she answers the phone with a hey & after he says something responds with "oh nothing I figured it out".

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I understand that he may have been abrupt with her hence her response but still even if he was why not just tell him instead of wasting his time/making herself look like a fool. It sort of struck me as she wanted his attention too in a way.