De-aged au where Jason wasn't de-aged to when he was Jaybin, but to when he was catatonic.
When Jason turned into his 16 year old self, everyone thought he'd be the same as he was now, just younger. But no.
16 year old Jason was like a shell of a person. Standing, staring at nothing. Responding to nothing, as if he wasn't truly present. However, one of the people the bats were fighting tried to attack Red Hood with a metal bat since he would be an easy target with how he doesn't respond to anything. The bats who saw this tried to run to Jason to protect him. However, Red Hood attacked the man. Like a reflex, his movements too mechanical, no special flare he usually has when fighting. As if he was fighting on autopilot. The bats sighed in relief and decided that Jason could protect himself and refocused on making sure none of their opponents were standing.
As the fight dragged on, the opponents made sure not to fight the younger Red Hood as when someone did, they were either beat to a pulp, close to death or had died. No one else wanted to try their luck.
Then as one of them managed to get a hit on Robin, Red Hood had basically teleported with how fast to travelled to where Robin was from where he originally was standing. Red Hood then decapitated the man's head before walking up to Robin, picking him up despite Robin's struggle to get free. Then, he walked over to the wall, sat down, cuddled even closer to Robin, throwing Robin's birdarang whenever someone got to close. His precision was deadly.
Everyone in the room had stopped, watching Robin thrash around at first until giving up and leaning into Red Hood's hug with a sigh, arms crossed with an obviously displeased expression.
"tt, father, I expect you to hurry up and finish so I can escape this embarrassing position."
Shocked at what he was witnessing, Batman took a while to process what was said to him before nodding and capturing the last of their opponents who were still to shocked to move.
After handing them off to the GCPD, the bats tried to get Jason to get up and come back to the cave, however he refused to move from his spot, they didn't dare to force him up due to Damian's worning. But Jason was not responding to anything they said which was worrying them, that is until Damian started speaking.
"Akhi, it is safe in the cave, you can cuddle me as much as you want there." At this, Jason promptly stands up while Damian guides him to the Batmobile.
"What the heck did we just witness?!" Tim just exclaimed in disbelief, that not only was Damian being tame, but that he didn't say anything rude about Jason? And he called Jason 'Akhi'? What the hell!
After getting back to the Batcave, Damian explained about how Jason was with the LOA during his years after coming back from the dead, but was in a catatonic state until his mother pushed him into the pit which 'fixed' his mind, bringing him back from his catatonic state at the cost of amplifying his emotions, which was why he was so angry at Bruce when he first came back.
Damian said that all while in Jason lap while getting his head patted.
It was a conflicting scene. Jason, face blank but stroking Damian's head softly, while Damian in his lap, scowling with his arms crossed, but was leaning back against Jason as if it was something natural.
Damian then added that the reason Jason is acting like this right now is because during his catatonic state, Jason was placed as Damian's guard due to the way he would protect Damian from any danger since the first time Damian was attacked in Jason's sight. As if Jason was a mama lion and Damian his cub.
"Now hurry up and call Zatanna. Akhi hates letting anyone know what happened when he was catatonic."
Bruce just nods before turning away to call Zatanna while the others still look at Jason is bewilderment. Luckily for Jason and Damian, Zatanna was unusually free and would only take an hour to get there, much to the others displeasure.