Pardon Me, I'm Almost Finished

This happens more than you would think:
(hypothetical person denoted 'Bob')
Bob is washing his hands at the faucet in the kitchen of the state room. I need to wash my hands as well. I go stand next to Bob so that I can use the sink after he is finished. This makes Bob anxious.

Bob thinks:
Why is she just standing there!?

Me:
I wonder if he knows I'm in 'line'. Does he not know that a 'line' does not have to be several people in length but can in fact be used as a slang term implying 'waiting for the use of the designated "tool"'?

Bob turns around to look at me, a motion resulting in him stepping away from the sink, as if to indicate that he welcomes my shared use of it. But his hands are still scrubbing away under the spout, an obvious sign that it is not yet my turn.

"Sorry" he says.

Me:
Please don't ever apologize for proper personal hygiene. I'll accept apologies only for your failure to uphold my sanitation standards.

"It's fine" I say

He continues his washing, but does not return back to his initial stance in front of the sink. Instead he remains distanced from it, as if to prematurely depart from the cleaning station. After finishing up, he turns off the faucet and dries his hands.

He glances once more at me and quickly apologizes again. "Sorry," Bob says as he turns the faucet back on before I have a chance to step up to the sink. I like to think of this random act of kindness as a way of saying, "Don't worry, I didn't forget about you. I am not a selfish person."

However, once an official line forms (two or more people), Bob no longer feels rushed. His handwashing routine returns to normal.