Train scene in the redemption episode

Vague title because I hate stumbling on spoilers so I’m cautious about it.

The train scene of the episode where Charlie is trying to redeem Angel had me thinking: what would’ve happened to Husk if he got hit?

I remember seeing a discussion here about that scene where Vox throws the woman Valentino was holding into Shock.Wav’s tank, killing her. It seemed like most people believe a sinner would just respawn if they took a fatal blow.

If that were true, then why all the panic about Husk being possibly killed?