so if you enter on a second entry, which , signals a second leg, the trade has be closed, when you get a [first ] signal in the opposite direction.
now if the second leg is extremely srong and you get a first signal in the opposite direction, then that signal will like fail beacuse traders will look at that signal as a correction rather than a reversal, and smart traders will be fading that first opposite direction signal.
if those traders are right about the fade, then you will get another signal, same as the signal before, for one more leg ......this is what happens in a trend.
if a second leg is not strong, then the first signal in the opposite direction, is likely, a reversal signal.