The slippery bridge

All summer we have been walking this path through the woods, crossing a stream which was either dry or a trickle, balancing on a couple of wobbly rocks.
 
These trees have been laid by kind souls as a bridge for the careful. However, when you’ve come downhill after torrential rain, and it’s muddy, and the squillions of fallen leaves are now protosludge, so your shoes are ultra slippery: then you cling to the trees and sidle over ultra carefully.