Robin Smith wrote a classic and poetic essay about his climb on Carn Dearg Buttress (Ben Nevis) with Dougal Haston. "The Bat and the Wicked" was printed in the SMC Journal ... Well worth looking up.
" Then there came a sort of squawk as Dougal found that his ledge was not. He got a hand on it but it all sloped. Rattling sounds came from his throat or nails or something. In his last throes to bridge he threw his right foot at a straw away out on the right wall. Then his fingers went to butter. It began under control as the bit of news "I'm off," but it must have been caught in the wind, for it grew like a wailing siren to a bloodcurdling scream as a black and bat-like shape came hurtling over the roof with legs splayed like webbed wings and hands hooked like a vampire. I flattened my ears and curled up rigid into a bristling ball, then I was lifted off my slab and rose five feet in the air until we met head to foot and buffered to a stop hanging from the runners at the roof."