Giles could feel something from him: power, of a sort that makes him cautious, makes him stop and take notice. The man isn't familiar, but he does recognize the tension of a bottle held just so, the stance that signals all hell about to break loose. Giles has had a little too much chaos in his night already, and it wears on his patience in a dangerous way. He is standing before he can regret doing so.

And now that grip is heavy on his shoulder. He smiles back, with no amusement at all, and makes himself very steady and solid under the man's hand. He radiates mild but stubborn insistence, and does not budge. "Then I'm very sorry to interrupt."

Witches are not known for their ability to take punches. In public, with a Daybreak sense of discretion about magic, he is simply a very bold or very stubborn middle-aged man. As a rule, it will end with no one bleeding, or his nose broken, and nothing much in between.