If a Bandersnatch gets a hold of your noggin, it will try to squash the brains out of you. Take it out with Explosive Arrows, the Shotgun, or avoid it altogether. It's fairly pokey, and announces its attack, so can be easy to avoid, especially in open spaces. Moth Cocoon It can be argued that the Moth is the most annoying enemy from any of the RE games. It is weak but quick and attacks from every direction.
Moths fly above and drop curtains of poison from the air.
But wait, there's more. If a moth attacks you from behind, it will lay a cocoon on you. Then, you will have to walk around with the cocoon on your back until the organism decides to hatch. Upon hatching, you will be immediately poisoned. Avoid these attacks by always facing toward them.