With mana conservation as his top priority, Jack prepared for a battle of attrition. He understood that Duorda wouldn't be so confident under normal circumstances, even after showing off three unknown trump cards.
This most likely meant one of two things. Either Crypt Lord Duorda was a truly a mad, battle-crazed being or he still had aces hidden up his sleeve. And Jack assumed both to be correct, just in case. He'd rather be overprepared than to get caught off guard and killed. That would be the worst scenario given Duorda's unique Permadeath spell from earlier.
The crypt lord chuckled and charged again. His giant sickle was over a meter long, arching to slice Jack's torso in two. Duorda acted as if the flames erupting from Jack were nonexistent.