I've noticed this behaviour many times. What's the right action here?

This happened to me tonight while I went out solo (didn't get anything as my choice of venues tonight was horrible and my state wasn't that great). So before I head home, I say to myself fuck it, I'll go in this pub and have a half pint then head home, got lost so it was the perfect break. This blonde, hb9 is with some dude checking me out, the way he was looking at her suggested he was into her, I didn't see any kino, so they might have been on a date or something, the guy was very chody. Anyways, what would be the right action next time this happened, the venue was quiet, the dude goes to the bathroom and she's sitting by herself. I kind of wanted to go over and say "Is he boring you?" or "Are you on a date?" followed by false time constraint, give her my number and eject. What would be the right action here?