I found an interesting thing late last night.
I was messing around with my sampire in shame because he sucks and doesn't have good gear yet. I was not really paying attention to the spawn and somehow, I let myself die because I wasn't casing whirlwind. Son of a gun. So I pulled the whole "I'm stuck" game, went to brit, rezzed, then back to my house. I logged out and in to my mage, opened a gate to the level of shame he was on, relogged my sampire, took the gate and collected my things. Messed around for another 5 minutes, and returned back to my keep.
I wanted to log into my smith for a minute and I was on that whole 5 minute delay (or however long it is) for having aggroed monsters that I didn't kill. However, I was able to log onto my mage. I was standing in my keep with my other character not logged out. I could buff him with my mage and just to test, I relogged my smith and he couldn't log in. My mage and my sampire could though.
I think if you've recently logged in with the character (10 minutes?), then it somehow circumvents the wait time for combat flags. What is this good for? I don't know. Maybe you want to swap to a spellweaver to last hit a low guy, no idea. Just thought I would share it. Maybe you want to use 2 of your own weavers to get arcane focus count up. It's really not that cool, but I found it kind of funny. It's not an exploit to make tons of loot :p