The Bak is an enemy in Momodora I.
Baks are square enemies with a pair of eyes, a spike at the top and two tooth-like spikes at the bottom.
Upon walking under them, they will fall down, trying to damage the character. Regardless of hitting or missing,it will slowly go up to its starting position again. From there, it will try to do the dropping attack again.
While Baks are able to attack vertically, they are completely defenseless in the horizontal. Try to get to them from the side and you can handle them easily.