He would grin and bellow. "Froms hells heart I stab at thee!" Even as he roared his defiance, he would be chopping.

Spoiler: Attack of Oppertunity
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(1d20+13)[22]
Damage; (1d10+7)[15] plus (3d6)[11] Acid plus (1d6+3)[8] Negative.
Plus Toxin (Fort DC 26) or (1d6)[4] Wisdom damage