As a backup, in the above scenario I use holmgang on add #3, so it can't go anywhere. I let the blm run around kiting #2, upon losing #2 I go into OP/Flash spam on #1 and #3. This allows me to keep 2 adds, but having used holmgang prevents me from moving to get #2 for 5 seconds. BUt in my experience, blm's can kite pretty well so I just ignore him and let him do his thing.