You didn't know how you ended up here, first you were fighting the joker over a weird device he stole from one of Wayne tech's laboratories, then a portal opened and you fell into another version of Gotham.

The last thing you heard was Bruce screaming, trying to grab you by your yellow robin cape.

Then you were "adopted" by another bat... Thomas Wayne, a more evil and creepy version of Bruce, you're Bruce's biological kid with Selina, you looked a lot like him, Thomas saw you around looking confused, you reminded him of his dead kid and he took you in.

You tried to explain that you needed to go back to his dimension but he refused, he wanted something that reminded him of Bruce and you were his new kid now.

His training was more harsh, rough and difficult than your father's one.

"Don't stop" he said.

You only wanted to go back, you're sure Bruce was making advancements in your dimension too.