3k time trial - 10.21

I was planning on running at SMC this weekend but other plans have popped up so instead decided to do a 3k time trial at Run Club tonight.
Ran 4k (10 laps) around the oval as a warm-up in 18.25.
We then did drills and some run thrus and headed over to the time trial course.
Rob is just getting back into running after a layoff so no real competition, just had to battle it out by myself. Felt pretty good until 500 m to go when I really needed to go to the loo, so had to slow to avoid an accident. Still, happy with the time. Why does this happen ?
Did a slow lap of the oval after.

Total 8k.