Couple of problems with that method. OFP's damage system is actually more complicated than it seems. I still haven't quite figured it all out yet. But I do know that it is possible for a unit to be killed and only have like 0.7 damage. The location where a unit is hit seems to influence how much his 'damage' increases. And how much damage different areas of the body have suffered affects when a unit dies. I think that your method may work, but it may have some unintentional quirks in it. Also, the player would never get bloody or have decreased aim, since he would always be at 0 damage. But it really may be the only way to do this thing.