"What? Wait a second, are you talking about changing the future?" Zero asked.
"Yeah."
"But wouldn't that like… create some paradoxes? You should know what I'm talking about right? Trying to change the future might mess up the whole timeline," he reasoned.
Now that he was sure that the girl in front of him was a future version of himself, he was quick on the uptake and was cooperating with her— or himself— in no time.
"You are right, but I have already done an experiment by changing something minor in the future before I came here and the rules of time travel here are rather simple. Neither a paradox nor a new timeline is created if you changed something in the past, instead of that the current future timeline vanishes out of existence and a new future is created," she replied.
"So… what you're saying is that if you change something here in the future then it won't mess up the timeline but create a new future?" Zero asked in confirmation.