In the first one the guy let him back up and the other guy went right after him again.
I gotta work on my standing double leg for real fights cause you can't exactly use the low single on concrete.
you can but I don't recommend it. Work on a body lock, I'm a big fan of tying people up in self defense situations instead of diving for a double which can leave you exposed a bit. The old randy couture fight and win series has a good example of protecting yourself while closing the distance and using the clinch for the takedown.