Same thing happened to me once on the start of Cracked Actor at Trowbarrow; I managed to avoid taking to the air (only just!). When I also fell of Forked Lightning Crack at Heptonstall, I had no excuse other than my own incompetence!A friend of mine was once climbing 'forked lightning crack' at Heptonstall and an owl (unsure of species) flew out of the crack into him when he was on the route, knocking him off.
I now remember that I've also seen a barn owl roosting at Yockenthwaite pot before.