I'm assuming they'd die else anybody who's been trapped under an avalanche would've been in cryo and not just slowly suffocate to death.
@ Senpai - Age rate/appearance then
I need some reason as to how Saito and kanzashi look near the same age in the bad future when he's trying to kill her.
How would a kid react to someone saying "Oh, I know you from the future. You killed your mom"?