It's something that has only happened to me twice, and I'm curious if anyone else has gone through it.
If I were to describe it, it's that one instant when you're writing your story, and as you're getting to the part where you start narrating one of the characters, you suddenly get this… jolt and feel as if what they just did was THEIR choice and not yours. As if you no longer controlled what they do or how they react but rather that you're just spectating and writing it down.
For me, the first time was when the protagonist got attacked by some magical creatures and woke up without an arm. In the setting, regrowing a limb wasn't impossible, just complicated, but it had been the first time he'd gotten messed up to that degree. It was originally meant to unfold with him swearing revenge or whatnot and storming off to do something courageously stupid (again). And yet… the scene just refused to come out that way.
Instead, what came out was that he woke up and noticed his missing arm and… stopped, not moving nor saying anything for a moment before deciding to step outside for some air. And as he bent down to tie his shoes and realized he wouldn't be able to do it with just one hand he just… crumbled and broke into tears.
That time, it felt like I'd been hit by a hammer to the chest when I wrote it down, the character had been meant to be super proud and boisterous and his own development arc was supposed to come further down the line but instead got kick-started to that moment in the story (Had to rewrite everything I'd planned for).
So… yeah, what was your "Oh shit he lives?" moment and what did it mean to you?
Source: reddit post