Hellboy had scoped out the options for getting out for a smoke, and was pleased to see that the courtyard was rather nicer than the side alley exit. He's had some (non-alcoholic) drink and some food, and knows he's going to have to do without for the duration of the movie, so he comes out here now while chomping down the remainder of a slice of pizza.

After a quick glance around, he settles down on a bench seat near Hermione's table -- adjusting for a moment to make sure the sword slung on his back also settles behind the bench out of the way -- and goes through the ritual of lighting up a cigar.

A couple of puffs to get it going, and he looks over at the woman nearby and says, "How's it going?" If she chooses to look up from her book and talk to him (and hopefully not freak out about his appearance, but he's currently in a mood to mostly forget about that possibility at the moment), great. If not, he can enjoy his cigar just as well in silence as conversation.