Why didn't Jia save it?

Jony J did not save Nie Lei for the following reasons:

1. He doesn't know much about Nie Lei. He is only entrusted by Nie Lei to take care of Nie Lei's life.

2. Xiao Jia thought that if he came forward, it might implicate Xiao Dong, so he didn't come forward. After the accident in Nie Lei, he just called Nie Lei's family and asked them to pick up Nie Lei.

These are just some possible reasons, and there may be other factors in the specific situation.