What should you do when you find you have made a mistake like that? Some people never admit that they are wrong and continue to find new, and often mutually inconsistent, arguments to support their case - as Eddington did in opposing black hole theory. Others claim to have never really supported the incorrect view in the first place or, if they did, it was only to show that it was inconsistent. It seems to me much better and less confusing if you admit in print that you were wrong. A good example of this was Einstein, who called the cosmological constant, which he introduced when he was trying to make a static model of the universe, the biggest mistake of his life.
Stephen Hawking - "A Brief History of Time", the updated tenth anniversary commemorative edition
I read it and it struck home. It appears harsh at first, but when you really think about it, it's probably the easiest way to deal with being wrong. You get it out of your system and don't need to dance around it or awkwardly explain to different people over and over why you have (not) been wrong. All within the borders of sensible, of course, I'm not saying we all should make public announcements every time we make the tiniest mistake. But sometimes it's easier to make a thread in your guild's tactic forum and admit that you've been wrong, rather than having an uncertain number of people either having learned an incorrect thing from you or learning the correct and then questioning your competence.
So, yeah, Tyrannus heals when the healer is branded, not when the branded person is healed, as I, for some reason (read it somewhere, no idea where), thought all this time. Not such a hard thing to admit, really!