Why did Lev kill them? And why couldn't Jasper open the car? Spoilers.
Why did Lev kill his past family (and I think his past stub self)? I didn't understand the logic of that, I may have missed something.
Also, why couldn't Jasper get into the car he'd left on the train tracks. It showed a remote control inside the car, but how and why did he lock it when he got out?