Soldiers with this flaw never automatically regenerate health when it's low. It is one of the most effective flaws.
Soldiers with this flaw have a big disadvantage: you can't hide in cover and regenerate to quickly come back to the battle, and if you play battles on maps without health pick-ups you can never restore health unless Medic from your squad gives it to you through Rapid Regen and Healing Aura abilities. Squadmates with this flaw usually have big amount of deaths.
A Gunslinger, Sanchez has this flaw.
- This is the second flaw you can experience, after Loud.