Not sure if this is the case for you or not....just guessing.
If it seems like an aatxe comes at you without aggro'ing its because of a Dying Nightmare.
To be more specific, its a Dying Nightmare that hasnt popped up yet that causes the aggro of the aatxe. Essentially, you aggro the pop up, which brings the aatxe as he is a part of the group.
Make sure you use a longbow and anticipate the aggro'ing window where the graspings are closest to you.
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