Really Small Detail I Noticed in Chapter 4

When damaging the Player, the Nightmare Critters (including the large Baba Chops) don't use their mouths at first. Rather, they resort to punching and kicking the Player until they're too weak to fight back. In contrast, the Smiling Critters (who are the same size, yet are less aggressive and toothy) don't waste any time in just tackling the Player to the ground and biting them.

Somehow, I think Harley has something to do with this.