One of the most annoying parts about duelling or when you just zone with auras on, they flag you and will more or less guarantee a trip to reclaim.
I suggest that all hostile and debuffing auras should be unable to land on another player or it's pet unless both players are:
1) Flagged.
2) 0%-25% gas.
3) Engaged in a duel with eachother.
This of course goes for AoE attacks as well and this is a long lived problem that AO has had over the years. I hope to see this get changed once rebalance makes it here (or earlier if possible! :P).