Hate stays on people after they move floors, but I'm pretty sure the hate is shared between everyone in the zone, so if you RRed it would have attacked you since they can't reach the other people. In fact, in Apollyon if you aggro mobs after you change floors, you can still see them in the distance.
http://img414.imageshack.us/img414/2189/img02840jw.png
Solution? Have the people that zoned up logout. When we were in the same situation we did this and the mobs went out of their "combat mode" and moved back to their original position, which allowed us to reraise hate free.
Can't explain what happened to the 2 blm though.