FrogReaver
The most respectful and polite poster ever
What the heck just happened is in game he broke his Oath and now he is no longer a Paladin. That's an in game call that doesn't require the GM and player to be on the same page. A player doesn't have to agree with me that his character is falling and is about to be in a lot of hurt after stepping into a pit with rusty spikes on the bottom.
Where he wants to go with the character from here is an appropriate metagame discussion, but one thing is for sure he is no longer a Oath of the Ancients Paladin. None of my proposed resolutions take away the character. At most they take away some mechanics while adding backstory. If the player thinks that the character would be terribly upset to find he's not an Oath of the Ancients Paladin, or if the player is actually upset, then I'd suggest channeling that upset into a great story of redemption. If the player thinks, "Wow. You have a really harsh standard you are holding Paladin's too and I don't think I want to be a Paladin if it is defined that way.", then that is also a good story I think.
And yes, that there is a learning experience is entirely the point.
Wow. That's really all I can say. Wow.