It could be that this contact was playing with some dodgy addon for Messenger since he/she signed in/out so quickly (see eventlog).
On the other hand, sometimes it also happens when you are low on resources at that moment (I experienced this once in a while when my resources are low), but then again, you wont see so much "hops" in the eventlog in that case. It could also be a small bug in his or your Messenger...
/ 
