why time horizon can be fixed like this?

[hanbinjang]

Thank you for your excellent research.

I have a question regarding the time adjustment of second trajectory in the code.

In the existing code:

adjust timestep

trajs[:, :, -1] += self.horizon - self.first_stage_horizion

I found that the second trajectory's timesteps are 5.1 to 10.0, but they should be 3.1 to 8.0.
Could you please explain why this adjustment is done this way?