Maybe my browser is just mad at me for something. lol
I doubt it, the simplest solution, and I wasn't jesting, is to constant refresh the online list if you really determine to see.
I got bored and did similar myself, sure enough BeMi likes to hang out on the Stats page a lot, but I saw her check her messages at one point and another look at her profile.
But I digress, stalking is not fun.
If you really want to see. The easiest approach would be to see when that person is online. Bam random message. And then watch. ^^