I think just a [i]little[/i] more damage and you shouldn't be able to hurt yourself as no other supers hurt the user.
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Well the warlock grenades do damage so since this super is essentially a massive warlock grenade it makes sense... Though I kinda agree with you, just playing a little devils advocate
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I agree it shouldn't hurt you. It doesn't make any sense that it does as you can stand right in a vortex grenade and it won't hurt you.