Overall the crag was slimy and damp, however we found a small area that appeared dry and climbable. A fellow climber had recommended the slabby route, and the crux was clearly well protected so relatively low risk. Downclimbing from the crux was easily possible. A pad was placed below the route to protect the first few metres. A small damp patch was noted however this was off route. Route was within capabilities of climber, but near the limit. Belayer was experienced in catching falls on gear.
The climber placed two high quality pieces of gear (one on each rope) at the horizontal break just before the crux, rested and then attempted the move. Their initial attempt was unsuccessful so they downclimbed and traversed slightly, coming away from the dry line of the route and onto wet rock. This caused a fall which was well held by the gear and by good belaying, however panic caused the climber to flail and grab onto a block with a sharp edge, slicing deep into their hand.
Climber was lowered to ground, hand was improvisedly bandaged and taken to Shepton Mallet Hospital.