The Knight Commander is the boss of the Dread Spire in the Dread Ring, for those who aren't sure.
Basically, if you interrupt any of his moves (using Templar's Wrath or the burn effect from Smite, as examples), the animations will show him as interrupted but the move itself will still occur. You'll get the sound effects and the damage from the move even though the Knight Commander is flailing around on fire.
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