I'm pretty sure hunters can go fast than the auto run by doing ground dash > jump air dash > ground dash repeat. I can't quite confirm it but I'm nearly sure of it.
Also for some PAs like the Partisan's rave part- I mean AoE skill where you spin your partisan, if you do it on the ground you won't be able to move and you'll have lag at the end of it but if you do it in the air you can move a bit and won't have any lag after the animation.
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