Batgirl #6 is a direct let's-pick-up-right-at-the-end of Batgirl #5 issue. There's a new villain with multi-colored hairdos named Gretel that can appearantly mind control people. I guessed that it was just men last issue, and that's pretty much confirmed here. Anyway, she took control of Bruce Wayne's limo driver who I think had a gun for some reason, so Batgirl swoops in to save him. Only... Bruce Wayne is mindcontrolled, too. And he's motherf@$#ing Batman. So Barbara is about to face off against Bruce, who has a crowbar and an angry expression. She doesn't want to hurt him, but is also worried she might lose to him in a fight regardless. He keeps repeating '338' - a signature of all of Gretel's victims. Batgirl does a pretty good job fending him off. She's also remembering Bruce's support after she got shot by The Joker, so we get some insight into their rebooted relationship. They weren't close before that, but looks like he had her back and they became buds after. I guess to get Batman to like you, just get shot. Anyway, Batgirl is winning... then she gets slammed on the head by Bruce's personal assistant. This was awesome because I totally didn't expect it. Then that female cop shows up who hates Batgirl from the first 4 issues and I think pistol whips her.
The whole issue was very violent, obviously.