Human shield 6* Jesus active skill problem

I dont know how in defense but I was using him in attack and when he has full red hp bar and some blue bar with bonus hp then he uses his active skill (regain hp for 2 turns).
This is kinda stupid because he cant regain bonus hp and red hp is full.
If he acting like this in defense then team lost human shield and defense is weaker.
Maybe its time to fix this?
@Shawn.Scopely can you take a look at this?