I have a serious problem with actively trying to uphold your oath and failing triggering an oathbreaker situation. If you're genuinely undertaking actions that uphold your oath and you imply aren't physically able to do so, that's not breaking your oath, that's just failing to do a thing. Oathbreaking should be an active, conscious choice in some way. Even if you don't choose to specifically break your oath, you should at least have chosen to do the thing that broke it.
I can go either way on this. Broadly I agree, but having sworn to protect the weak I could see an argument for making it possible for a paladin who fails to do this break their oath, even if it’s through no fault of their own. It would be a cosmic injustice, sure, but that has dramatic potential!
Still, given it would no doubt be extremely traumatic for the paladin in question, it’s not something that should be done trivially, such as by failing to save one bloke who can be shoved into a pit while the paladin is on the other side of the room or else runs foolishly into a pack of hostile cultists.
