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Sustained doesn't care because overall exposure is the more relevant factor to sustain, not how long someone is stuck in one place.
Exactly, i would even argue that in general, not counting only duels, it benefits air burst mech more, Especially kiting, like Braconiere often does.
Fly out of corner, fire your shots, dodge back in and reposition yourself faster than before, even less exposure time.
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But i see your point now, and most demonstrative example would be open field battle of air burst vs air sustain, but i still don't agree that it's a straight buff to sustain.