I think that Jon unconsciously tunes into Damian and I don’t mean just his heartbeat but his voice and surroundings as well. He started doing it after he found out Damian has died before and did it out of anxiety but now it’s just background noise. However the moment someone insults Damian or when he gets into big fights with his family members (read:Bruce) not their general petty ones, it comes to the forefront of his mind and it takes everything in him to not go there and defend him.
Everyone is confused whenever Jon randomly has beef with them when in true detective fashion Tim figures it out, at first he thought Damian just told him but sometimes he comes out of nowhere after someone insults Damian (Jon has anger issues he just can’t help himself sometimes) which is when he tests it out by insulting Damian very badly while holding a sign 🪧 saying “I don’t mean it, I’m doing an experiment so don’t say anything” which confuses Damian who only gets even more confused when Jon comes barrelling in before it clicks.
