Now it makes more sense, with the following video and explanation shared by director Matt Reeves: “What’s interesting is that the reason that Joker’s in the movie is there was actually another scene that was earlier,” Reeves previously said in an interview with IGN.
“And because the movie is not an origin tale for Batman, but it’s his early days, it really is an origin tale for the Rogue’s Gallery’s characters. And for me, I think [it’s] this idea that the Joker is not yet the Joker, but they already have this relationship.”
“The scene that was not in the movie…it’s a scene where Batman is so unnerved because the Riddler is writing to him,” Reeves added. “And he’s like, ‘Well, why is this guy writing to me?’ And he figures he’s got to profile this killer.”
Watch the video below:
https://www.youtube.com/watch?v=FBeccCU_pEE&feature=emb_title