at your 5:36 where you turned off at the strange fenced off thing, that's where Mark S's training was based on Wedesdnay, I saw the signs & thought it was for a night race.... 7th sounds good!
Did you miss some signs at 10 minutes? weird wiggle!
no it was the course - and really thick mud and very slippery going up the hill and on those loops! Didn't see any signs on my run today, but there was a car with a skeleton in the passenger seat that probably belonged to someone involved.