10K interrupted - Mon. Nov. 6

Doing a reverse Enfield on a mild and moonlit Monday night, was going fine, but felt oddly stiff in the thighs; also a tight shoe was bothering me. Then after 5 miles, coming along Allen from Enfield, started to feel especially odd in the right leg. By the time I hit 202 I realised it was not working right--in fact it was quite numb! When I stopped and tried standing on it I almost keeled over. Tried loosening the laces and restarting, but it was not ready, so I gave up and stopped the clock. Waited a bit and then tentatively jogged home--seemed better, and I was okay by the time I got back. But odd, a bit creepy, and nto something I want to repeat. Here's what I managed before stopping:

Time: 40:01
Speed: 8.4 mph
Distance: 5.62 miles

Comment: some sort of blood flow problem; I must be susceptible to overtight shoes. It really felt like a dead leg of the sort you get from doing seiza 正座 for too long. Bouf. Live and learn.