Baba got to kick Mitsuko around to his heart’s content because she was alone at the time and unaware of his immobilizing robot mosquitoes. But she was never going to be alone for long; Mitsuko is someone with many friends, and two of them in Awatsuki Maaya and Wannai Kinuho arrive in time to save her.
Maaya uses her buoyancy manipulation to make Mitsuko temporarily light as a feather, so Ruiko can get her to the hospital quickly. Then she and Kinuho show how well they work in sync by demolishing Baba’s dog-bots one by one. Unlike Mitsuko, Baba has no friends. It would be pitiable if it were not all his fault for looking down on everyone.
Ruiko succeeds in getting Mitsuko to the hospital, and Misaka just so happens to witness her battered friend being unloaded from the ambulance. It’s too much to bear. Blaming herself for letting Mitsuko get hurt, a switch flips, and Misaka calmly starts walking, not running, towards her target.
When two of Shokuhou’s clique attempt to stop her, she gives them a choice: let her walk right past them to her destination, or walk right through them. The girls wisely stand aside. Hopefully they’re merely being controlled by Shokuhou and aren’t aware of the crimes she’s committing.
Baba turns down help from his mysterious business associate so he can claim all the credit, which turns out to be his undoing, as is overconfidence in his ability to quickly analyze and neutralize Kinuho and Maaya. He believes he can trick Kinuho into exhausting her water then mobilize his reserve dogs, but Kinuho had a water stream in reserve, and uses it to waterboard him, for a duration that’s not as long as he deserves.
He also thought Maaya was a telekinesis-user, but she’s actually able to control the buoyancy/gravity of herself and objects, including the last trick up his sleeve: his second robo mosquito. She neutralizes it just as it’s about to bite Kinuho, proving yet again that there’s no substitute for friends who care about your well-being in your corner.
Baba ends up running away screaming after Wannai tells him something he needs to hear about his personality flaws, but he’s not screaming because he’s scared. He’s angry because the girls looked down on him, which is what people do to worms like him but he for whatever reason doesn’t see himself as a worm.
He flees to a trailer in a cargo depot and prepares to mobilize his giant Mantis-type robot, planning to get back at Kinuho and Maaya by not just killing them, but defiling and humiliating them and broadcasting it on the internet. You know, just in case you forgot what an apocalyptic asshole this guy is.
Of course, Baba’s most fatal flaw of all is relying so much on things that the Railgun can manipulate and destroy as easily as breathing. And he’s gone and made the Railgun very very mad.
The calmly ferocious avenging Misaka leisurely strides up to the Mantis, relieves it of its arms one by one, and with one nonchalant wave of her arm, reduces it to a cloud of metal shards and wires. She only keeps the communications equipment in tact so she can have a nice little chat with Baba, who is cowering in his suddenly useless control van.
Misaka can’t be 100% sure Baba isn’t being controlled by Shokuhou, so she let’s him of…this one and only time. If he lays a finger on any of her friends ever again, she promises not to hesitate to track him down and crush him. Part of me hopes Baba will learn his lesson and never bother anyone again, or even reform his ways…but another part hopes he’ll test her again and get buried in the grave he already dug for himself.