I used to work with a guy who did the same thing every time you went and asked him a question while he was in the middle of something.
He would answer your question politely and talk you through it etc... but when you got back to your desk he would ALWAYS over and over send you an email link to a Joel Spolsky article stating it took 15 minutes to regain concentration after you are interrupted.
His message being wait to I'm not obviously working, try someone else, or spend an extra 15 minutes (x2 devs) yourself trying to get to the bottom of it yourself.
He would answer your question politely and talk you through it etc... but when you got back to your desk he would ALWAYS over and over send you an email link to a Joel Spolsky article stating it took 15 minutes to regain concentration after you are interrupted.
His message being wait to I'm not obviously working, try someone else, or spend an extra 15 minutes (x2 devs) yourself trying to get to the bottom of it yourself.