"They were all Batman. They were all Bruce Wayne. But each one of them was a different person." "So, on the other line-time...[...]I'm the same guy?" "Yeah. Actually, pretty much.[...]Look, you're missing the larger premise here. In my timeline, when I..."
Battle at the Chronobowl: After a multiversal disaster in which two versions of BarryAllen died, Earth-1 Barry erased a timeline he created himself and returned to June 13, 2004, where he set out to remove the can of tomato that he had previously put it in his mother's cart. However, Barry also changed the position of the tomato cans so that his father's face could be seen on the security cameras, which altered the timeline long before Barry's alterations.[1]
Murder of Nora Allen: After returning home without the tomato can, Nora is killed by the Reverse Flash after sending her husband to get the tomato can. Henry was blamed for Nora's murder and went to prison while Barry decided to study forensic sciences to free his father one day.[1]
After obtaining evidence that his father was innocent in where his face was seen thanks to Wayne Enterprises technology, Barry Allen prepares to go to the court when a version of him arrives on the timeline in his place, erasing him from existence. This version turns out to be the same one that created the timeline and upon seeing a note from Iris West, he goes to the court instead where his father is declared innocent. Outside, he encounters Bruce Wayne, whom he does not recognize but Bruce thinks that this is his Barry.[1]
