Presumably, 15% Chance for SE and 35% Chance to Thorns, so combined, it would present 5.25% to "Double Critical", 9.75% Chance to Sharp Eyes, and 29.75% Chance to Thorns.
You can see the Double Critical in effect when he hits 38k Reds, when he other wise throws out ~10~20k-ish criticals? So maybe it does actually add +250% damage? You can see the 38k at around 1:15
You can see the Double Critical in effect when he hits 38k Reds, when he other wise throws out ~10~20k-ish criticals? So maybe it does actually add +250% damage? You can see the 38k at around 1:15