“How did you two become friends?” “I punched him in the face and he gave me a highfive” Jason and Tim brotherly?
Everyone has that one person that you didn’t really like at first but you slowly gained a better understanding of each other and then it transformed into a semblance of a friendship. Such was the relationship between Tim and Jason, but to more of an extreme given their particular circumstances. So when curious bystanders and newly introduced acquaintances asked them “How did you two become friends?” it was a bit complicated trying to figure out how to answer without accidentally giving away the fact that they were a technically illegal vigilante who worked outside of the law and a drug lord who’s legally dead and commits crimes
frequently on occasion. As a result there was a slightly… fabricated… version of the truth which funneled down to “I punched him in the face and he gave me a highfive” which was sort of true. Except Jason had tried to actually kill Tim, which is a tiny bit more severe than a punch to the face. But once the whole ordeal was over Tim had in fact tried to engage in friendly conversation with Jason and there was a high five at some point, though it came after they had gotten to a good standing with each other. It was slightly confusing to Jason that Tim had asked for a high five (and a photo) seeing as Jason had, y’know, tried to destroy Tim due to Bruce’s betrayal (or the betrayal that Jason had perceived from Tim’s arrival). But at least they were on friendlier standings now and could work together without trying to kill each other. Most of the time at least.