I'm currently on the second level of the campaign playing on Normal difficulty. I've noticed my health never regenerates after taking damage, similar to hardcore mode on multiplayer. The blood red tint remains around the corner of my screen if I'm shot, and I die much more quickly. Is this normal? I'm having a hell of a time beating levels because of this. What's particularly annoying is if I have low health at a checkpoint, every time I die and restart from that checkpoint, I keep the same low health.