Originally Posted by SoulStealer

Are you using fast forward? since if you are they often seem to attack a dead pest especially if all the pests are dead but the ability that kills them hasn't finished it's animation.

Rarely, but some girls have slightly longer special attack animations, so it even shows during normal speed. Star Lily is the one I regularly notice. Cactace is also very close to "overlapping" the animation for the next knight with her special attack, especially if the next knight is a short animation magic user like Violetta Tulip or DiYu dealing a "normal" attack.