all about context
That's a good point. If the OP did want to run the same workout as those two guys, what would be the appropriate gap? I agree that 5m might be cutting it a little close, but I think 15-20m would totally be acceptable. Anyone else wanna weigh in on that?
15-20m may be ok in a park. But in the woods it should rather be ~100m. If you're so slow that you're running after a chick, don't do it.