#not sure if the Cosmic Punch bullshit would actually help in a direct fight

[mzminola]

Okay chewing on this, two AU ideas:

One: Jason is getting help from Talia (or doing a favor for her) while Deathstroke is doing whatever the hell it is he did to Cass, and Jason comes across this. Jason objects to brainwashing people, and besides, that's the Batgirl he has like zero beef with because Why Would He (Yet), so he intervenes.

Deathstroke regenerates and Jason has Cosmic Punch Won't Let Him Stay Dead Mystical Bullshit, so this gets very messy very fast. Unclear how Cass's No Kill policy plays out against an opponent who regenerates, but considering what she's done to people who don't, and her, uh, everything with her mom, there's a lot of potential for Slade to rapidly come to regret his choices.

Two: during Jason's World Tour of Crime Skills, Talia sent him off to David Cain for some hand to hand combat training. This is instantly apparent to Cass the first time she sees him fight (regardless of circumstances) and Cass has some Feelings about this.

Bonus angst points: the first time Cass sees Jason fight is after her brother kills her, and he moved the same way.