I was kind of hoping Touma would grab hold of Accelerator with his right arm (negating his powers) and then just beat the shit out of him over and over. But when you punch someone in the face while they fly at you at 40 mph, that's probably better in the end. Good fight overall. I agree with Munsu, this is the first time where his power didn't give him instant victory, it only made the playing field level.
Touma one this one fair and square, and not just due to chance. It's a lot like his first encounter with Stiyl, where he may have negated the powers first, but was smart enough to set off the fire alarms so he could finish the job.
I also thought Index was going to munch on his head for not feeding her properly, instead of for making her worried.
Next week's preview looks very interesting. Looks like an evil Index shows up (red robed nun). It'll start as a beach episode, but it looks like the serious stuff with Index starts up again. I'm more curious how he will deal with Kanzaki. He won't remember her at all, and he and she had a few very serious conversations that changed the relationship between the two.