I'm really not sure what to put it down to, because of the isolated incident it occurred in, so I thought I would see what anyone else can com up with.
I was in the Belfrey Luna, going to fight the boss, when a member of the Bell Keeper Covenant invaded. He looked pretty suspicious, enough so that I immediately knew the outcome was going to be bad. Dual-wielding Heide Swords, A crown and no chest armour.
The fight went as expected: I lost horribly, but that's when the glitch(?) occurred. After I died, the screen faded, the sound played, but he was never banished and I was stuck staring at a grey-scale screen and the "YOU DIED" never showed. This happened 3 times in about half an hour (same guy invaded 3 times) until I finally gave in and went elsewhere. I was forced to restart the game each time.
So what do people think? Glitch? Hack? Or a really bad lag spike?