Morkus from Orkus
This seems to miss the whole point of the OP.
If person A jums over the Grand Canyon, it follows that A tried to jump over the Grand Canyon. But A didn't perform two different actions - trying to jump the canyon, and then actually jumpiing it. S/he performed a single action which falls under both descriptions.
Which descriptions are made true in a RPG, by whom, and how, is what this thread is about. For instance, you've describd a game in which the player gets to decide, by fiat, that I try to jump the Grand Canyon is a true description of the PC's action; and the GM gets to decide, by fiat, that I jumped the Grand Canyon will not be. Of course that's not the only possible configuration.
Er. It didn't miss the point of the OP, because it wasn't about the OP. The discussion has moved on in some parts of the thread. That's how threads work.