As written you can heal your friends with this, since it only specifies that you're moving damage from "a player card at your location". This includes damage on your friends and their assets. Team up with a friend on Beat Cop (2) and start shooting down 2 HP enemies without taking a test, or healing best friend Mark Harrigan so he can draw more cards and boost his skill value further; all while helping kill enemies and not taking any skill tests.
Definitely consider Shrewd Analysis if you're running these books; Secrets Revealed is very good action compression if you can get to 12 cards, but at 8 it's action neutral if you move (which is worth it to avoid taking a test). This one though is up there for one of the best health healing cards in the game because it does something proactive when you do it. Most healing is very reactive and therefore doesn't help you win a scenario if you would not otherwise be defeated.