Describing Heroic Deeds
Source Player Core pg. 405
Because spending Hero Points reflects heroic deeds or tasks that surpass normal expectations, if you spend a Hero Point, you should describe the deed or task your character accomplishes with it to the other players.
Your character's deed might invoke a lesson learned in a past adventure, could be spurred by a determination to save someone else, or might depend on an item that ended up on their person due to a previous exploit. If you don't want to describe the deed or don't have any strong ideas about how to do so, ask the GM to come up with something for you. This can be a collaborative process, too. The GM might remind you of a long-forgotten event in the campaign, and all you have to do is fill in how that event comes to mind just at the right time, motivating you to push past your limits.
Your character's deed might invoke a lesson learned in a past adventure, could be spurred by a determination to save someone else, or might depend on an item that ended up on their person due to a previous exploit. If you don't want to describe the deed or don't have any strong ideas about how to do so, ask the GM to come up with something for you. This can be a collaborative process, too. The GM might remind you of a long-forgotten event in the campaign, and all you have to do is fill in how that event comes to mind just at the right time, motivating you to push past your limits.