What does 风轻发自然 mean here?
I think it should be 轻快  instead of 轻发
轻快自然 (lively and natural) make more sense than 轻发自然 (come out lightly and nature)
Beside, '轻发' could mean  '轻举妄动' (act rashly)

轻发则多败
轻发：轻举妄动

I suspect the author thought '轻发'(lightly come out) and '轻快'(lively) mean the same