Okay, I get it, but I have a question about the checkpoint. I know there are three of them: one in the middle of the city, which you can't jump over, and two others at the top of the city. I tried to climb the first one, but a cutscene prevented me.
Do you mean that I should have gone around the fence and tried to jump? I did that, but the character can't reach the top because of the low jump. If it's not about this one, I don't know, there's only one way to get to the lower part of the city.