Today I had a tempo run where the goal was 2 miles at an 8:30 pace. I planned to run on the relatively flat trail in my area, but the road was unexpectedly closed for road work. I discovered this during the run, and had to take a path that includes a steep, 0.30-mile-long hill. I ended up stopping near the top of hill for about 1 minute, simply because I didn't expect to be running such a difficult trail at tempo pace. I completed the run, finishing at an 8:38 pace. How bad is it to stop in the middle of a run like this for training purposes?