Whats this NextDelay thing mean?
NextDelay is a property that activates a hidden “hit timer” that limits how often any attack from that group can damage a single target. This works similarly to the infamous spell timer, which limits how often any spell in that group can be cast. The difference is that the hit timer doesn’t prevent you from attacking, it just sets everyone’s chance-to-hit that monster (with a hit timer attack) at zero until the timer runs out.