If Barnabas were in his elder years, he would have harumphed at this point. However, he did still have his dignity (at least for the time being), so he refrained. She was fairly familiar - a year below him at Hogwarts, he thought. Her annoyance was obvious enough, though she wasn't exactly rude per say. She had a tone, though. One he was very familiar with receiving from women. It usually meant that they found him intimidating, and lost a bit of their composure because of it. Normally, Barnabas would have done the polite thing and overlooked it... but today had been far from normal.

"No need to be shrill," He told her with a glare and sank his head into his hands, elbows propped up on the bar, "I've the most awful head pain which I will apparently will have no relief from until 'the next few days'–and it's impolite to make it worse."