Today I was questing on a low level Warlock I just started.
A guildie came along to give me something, and did the courtesy Mark of The Wild and Thorns buff.
I was running along questing, and noticed things were attacking me and instantly dieing...
even though the buff description said only "6 Damage" to attackers.
So, I was running around dotting everything up and letting them come and attack me, while still getting full experience.
Little more info:
I was buffed by an 80 Balance druid, not like that would make any difference.