Duel wield is a % chance to produce a swing every time the delay elapses.
It has the same relative effect regardless of delay. There is no damage bonus or anything.
Your off hand weapon can still proc when the delay elapses, even if dw failed to produce a swing. Off hand only profs at half rate of main hand though.
Basically ratio is all that is important when considering dmg/delay and procs are disproportionately useful at low skill levels.
Once double attack exceeds 150 skill you can sometimes double attack with the offhand.
You can skill up duel wield even with a shield equipped (skill ups happen off the naked fist delay).
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