I feel if they made some effect on the hp bar to show hp that needed to be healed to release walking dead that could be helpful, perhaps helpful enough (the effect only vanishing entirely once they're A ok). Like the empty portion of the dark knight bar becomes a hazy red, and that portion shrinks as the hp is filled up (the negative space of the hp bar becomes colored/animated). Paladin's hp could become gold to show they're in hallowed ground.

I know a healer can already see if someone is low hp lol, but in this case they can also see something is further wrong with their hp. Just getting dark knight to safety amounts and going onto the next target wont be enough, it's still hazy! Something like that.