About to do some fencing on a steep hillside, part of the enclosed area will be almost vertical, with a beck at the bottom. I want to go straight down the hill, across beck to wall about 5metre other side, OH wants to fence along the hillside, land steep, but above the steepest bit, I'm worried if something slips, might end up trapped against the fence, I'm sure I've read something about that somewhere, thoughts please?