Once usually doesn't do it, when I do it once it gives the impression that it's actually being used, but doesn't.
I usually have to do 3 quick successive taps on my second skill that I want to do. From what I've experienced, it only works at skills two at a time too.
1. Tap the skill that you want to initially use.
2. Right after that, tap the next skill you want to use (this is where the 3 quick taps are).
If I do it fast enough, some animations of the skills even cancel out. (A Crushing Blow during Hell Scream). The GCD is still probably .5, but compared to the previous one when I couldn't even press a skill because of the GCD, this one seems faster somehow. Could be mistaken, just a personal opinion and observation
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