I was originally going to write something longer and more detailed, but it wasn't working out so I'm just going to make it short and sweet.
Relationships
You and [BLANK] teamed up a few times before the rest of you came together.
Incomplete
Your mentor is cautious; they asked you to keep an eye on Nahullad
After defeating the sorcerer that blasted him with that bolt, John needed to find Sancho and bring him back. In situations like these, Sancho is supposed to activate the SOS protocol in his communicator to allow his father to track him, but for some reason it wasn't activated this time.
It shouldn't be hard to understand why this freaked John out. He needed to find Sancho fast.
John combed the city hoping to find any clue of his son's whereabouts. Not wanting to waste any more time fighting, he would only briefly pass through an area before moving on. The city was in chaos though, and John still managed to see things that will likely stay in his memory forever. The most relevant here being Amy's beheading.
By this point John had already seen heroes fight against the monsters, hell even the villains were fighting. They've got families too you know. But this was the first time he was seeing one take on the monsters alone (besides himself of course). It's appearance radiated an unsettling form of confidence, but you could tell it was inexperienced just by watching it fight. Still, mindless monsters don't pay attention to obvious telegraphs so it seemed to be doing well in spite of the lack of technique.
It was not going to last. Another big monster like the kind that took Sancho, was approaching from an alleyway. There was no way they would be able to fight it on their own. John considered warning them, but then his communicator rang. Sancho had finally activated the SOS protocol. Overjoyed with the knowledge that is son wasn't dead just yet, he sped away straight for the marked location while forgetting about the strange figure he saw. He wasn't fast enough to avoid seeing the consequences of his inaction though. By the time Amy noticed the monster creeping up on her blind spot, it was too late to run.
John wondered what he should have done. Would the stranger have even listened to him? Though John did have his own problems to deal with, he still felt responsible somehow. It would have been easier for him if she was swallowed whole. As his horse skipped across the rooftops towards Sancho, John wondered if he should have helped some of the other people he passed along the way. Isn't that what knights were supposed to do? Was he supposed to sacrifice his son for the benefit of the realm?
You'd think finding out that Amy was alive would have cheered him up, but he only saw it as a living reminder of his own failures. Since the team was formed, he's had the misfortune of peering down that neck multiple times. Truthfully, he struggles to believe that the thing is what it says it is. You don't come back from losing your head like that. You just, don't. If you remove the brain, where is the soul supposed to be kept? Could a serum really move the soul?
Maybe it isn't so wise to think in terms of superstition, but we now know that magic is real. Perhaps we shouldn't ignore it.
Author's note. This ended up being larger than I expected. I took me 2 and a half hours to write. I still don't know what to do about the previous question, but I think this is enough for the time being. After re-reading Amy's backstory and finding out that she remained unconscious for the entire duration of the Cauldron attack, I think I want to rewrtie my "When the Team got together as Well". She wasn't present during the attack on the Cauldron's ritual site so there needs to be a different reason why she joined the team. I'm thinking we're some community run clean-up crew.