This is definitely one of those rules that I'm going to have to play through and experience before I decide how to use it. But I've done that with a bunch of rules that I couldn't quite game out in my head until I saw it on the virtual table, and it usually worked well.
About healing in-combat being a trap: I'd suggest that GMs play hostile encounters differently, too, with the enemies treating a wounded and healed PC limping away from the fight like that PC is not a threat, because they genuinely (probably) will not be. The PC will likely be trying to just get away. Unless the enemies are the recklessly vengeful or mindless types who would ignore a threat right in front of them to kick a wounded non-threat, that is. Even bullies have some sense.