Why doesn't Rash zip sometimes?

[xSkeletalx]

@Delriach

Wicked Tongue - Any Direction

Rash can zipline towards any direction when his tongue makes contact with a wall or opponent. Can attack on the way down. Wicked Tongue can also be used to eat most projectiles to gain Shadow Meter. Om nom nom nom!

I think @EveryManJack is correct, based on this, anyway.