This is a really fun, but weird sideways mantle. It's not too hard once you know what you're doing, but the delicacies are tricky if you're not a mantle queen!
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.