It was an enemy you couldn't defeat. You just had to try not to touch it. It was something like this:
x = Link
C= Chain Chomp
. = Chain
____ = wall
------- = barrier (you can't get trough, chain chomp can
" = Door
____________________________________________________
| .......C C ........ |
| ......: :........... |
|----------------------------------------------------------------------------------|
| |
|___ ___________________________________________ ___|
" "
Damn, I'm not good at ASCII drawing
Sorry, I can't do it, but you can imagine how that is
When I post it, the width changes, so I can't draw it exactly