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Can't think of any reason why Whirlwind would suddenly knock back instead of up. Levitate, Disembowel, and Jump Kick all knock up despite ragdoll physics being in place. Enemies don't quite go straight up and down, but it's close enough.
Considering the hideous endurance cost on Whirlwind, I can't imagine why they would feel changing it to knockback would be necessary from a balance perspective. Yes, it's some mad soft control, but not even a Regen scrapper is going to be able to keep that going for very long, much less attack while doing so.
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On my empath, I used to use it after RA to keep an entire group of mobs disabled. I guess this is the exploit? I thought I was using the power as it was intended to be used.
