Cassandra noticed the staring. She was always aware when someone was watching her. It was part of her training, after all, and partly how she was raised. So she turned slightly, glancing at whoever it was that was staring at her -- only to blink when she recognized who it was.

After all, Kon didn't really wear a mask or anything, so it wasn't as if he was hard to recognize. Cassandra had seen pictures and heard stories from Robin and Spoiler.

So, slowly, she approached him. Now would be a good time to talk, Kon.