Given that a high proportion of my running has been over the same half a dozen or so routes, largely in the Dales (well up until this year anyway), I have done a fair amount of what I guess is best described as 'rubble' running. I can pelt down rubble-y hills and tracks and seem to be able to pick my boulder to boulder hops two or three rocks in advance (kind of like snooker then ). And the thought of falling never enters my head....... which is probably just as well.
Running down hill though on boggy bog, marsh grass, greasy mud or wet grass and I've always been slower and much more cautious. I suppose I'm thinking that I'll slip and, simply by thinking that, become much more likely to do so. I remember following someone off of the main (rubble-y) path on the descent to Red Tarn I think during the Langdale Horseshoe race, along a boggy, slippery, 45 degree traverse 'shortcut' that the chap I was following professed to be his best descent and line ever and thinking (well knowing for sure actually) that I'd have gone miles faster on the rubble.
I have been practising massively on mud since and can look forward to more of the same in spades over the winter but I'm far from sure that'll I'll ever be faster that way. Any tips for bog running descents that I should try and take into account?