Sure thing.

Alright, this is where I got stuck.

It is actually rather hard to get stuck, you kind of need to try at it for a bit, and I'm not so sure exactly what makes you get stuck. However, once you do I find that if you turn towards or turn you back towards the cliff, the camera and your gun drop steadily, lowering under the ground and coming back if you turn.

Also, I found another bug.

As you see here, if you walk into this cliff you rise up it... sideways. The other, steeper cliffs you can't rise up, but this one appears to be just the right angle to rise up like that.

EDIT- Wrong screenshot. One moment.
EDITEDIT- Fixed. I should really avoid uploading multiple files under one name.