As you might have noticed, there are some serious routing-dependant latency spikes for some ppl, however there are some special things about these:
First of all, whilst these spikes last, your buff's durations do not matter at all, they cannot fade from you without the client's feedback to the server. - on the other hand, this prevents some buffs from renewing themselves... think of the demonologist's shielding spell.
Secondly, while those spikes occur you can still move around and initiate a instance change - mobs cannot attack you, similar to a lag jump, through this effect you can 'blink' ... well kinda.
thirdly: more to come...
Effectively this means f.e. this:
Have a HoT on you, then redirect your routing to a dead(with a bad connection to where your game server is.. Munich for me^^) proxy, this won't disconnect you!, then change back to your normal proxy(if you use one).
Congratulations, you have created a fake routing lag. Now during this time you will be healed for the an amount that is like... every second of the lag you get a healtick, but as you moved, the mobs - client side - cannot hit you, now, when the lag ends, first, the damage recieved, then the healing recieved is calculated and, the result should be positive, you live, at full HP!
This and/or other exploits like this can effectively be used by tanks and as a [YOU-LOOSE] button in pvp as it prevents you from dying, or .. for others... your hp reaches 0 and then you are blinked away at full hp haha..
This is nothing you can be banned for, it's something that occurres quite ofted due to peering issues ... well... they cannot know wheater it's on purpose or not