Reserve judgement.
I saw some of the best runners I know completely meltdown today. We're talking low 80 minute half marathoners running 9:00-10:00 min/miles in the second half for 3:10-3:30. They were prepared, but not acclimatized.
Maybe your friend got injured and still wanted to finish.
Reserve judgement. It's the smart thing to do. You could run a real turkey someday too.