“Guessing All The Truth” 

Not to mention that his current host and his future host somehow met at the same space and time, and they were about to cooperate together! 

Zev was excited beyond imagination. 

[Well, if she died here, she will die for real, and because she died in a parallel world like our world, her soul might not reincarnate normally and would be lost in the parallel space and time.] 

That's why, it was actually too dangerous for anyone to do time travel with their physical body. 

[And maybe she also has a deadline. If she didn't return to her world by a certain time, she would be lost in parallel time and space forever or be trapped in this world where she didn't belong.] 

[Since she's not supposed to exist in this era, if she stayed here for too long, either she could make the whole world chaotic, or this parallel world would slowly erase her.] 

Anyway, the ending would be miserable.