After hot cocoa and some nuts & M&Ms at the end of loop 5, I felt a bit better and restarted my engine. I regained a bit of speed towards the end and finally finished the race.
I was worried about my HR, but #CoachGPT assured me in its postmortem it's due to the mechanical failure of my left ankle/calf/knee chain with reasonable logic.
Next race is in March -- plenty of restoring/recovery work to do in the meantime!
#running #ultrarunning #trailrunning