Cho had wandered off from Melly and Pig in search of another drink. As she neared the bar, she spotted Handsy Bloke Number One making his way through the crowd. Fortunately, being a tiny, dainty thing, it was easy for her slip to the other side of a convenient fellow to keep from being seen.
Once safely out of sight, she glanced up at her hidey spot and realized she knew him. "Why, hello, Mr. Weasley," she said brightly. Now which twin was this one? She could tell them apart, sometimes, when they were together, but when apart she was clueless.