That doesn't make sense. 6% for each hand. Let's say u are 3% in each hand. That'd still be 3% of your total number of attacks.
100 attacks with 1 hand 100 attacks with the other. 3% crit rate on each would be 6crits out of 200 attacks, which isn't a 6% crit rate. 12 crits is 6% of 200 hits. It's 6% per hand.
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