Define "exploit".
If using the terrain and hiding from certain death is an exploit, then I exploit all the time.
Don't see why standing in front of the boss and getting swarmed left and right by enemies is the "legit" way. Seems like the dumb way.
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Taking cover is not exploiting. But sitting in an area that the AI is programmed not to go to or can't possibly get to is in my opinion an exploit. But I'm also guilty of it too. I just don't see a way of doing it without exploiting.
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If we're taking about the Nexus. The three places I know of, you can be killed. Not sure of any other ways personally.