No, it's not. It's a possible minor part of Yakumo's motive. But 99% of Yakumo's motive for slapping Eri was seeing Eri continue to be mean to Tenma after Tenma spent an entire night out in the snow waiting to apologize to her.
Originally Posted by Swampstorm
Comic violence is still violence. Are you saying that if Eri had merely slapped Harima after his false confession instead of Shining Wizarding him, she would be more culpable? That's absurd. At best, the comic element excuses the excessiveness, but it's still violence. That's why Yakumo slapping Eri is a shock: she isn't a violent character.
You'll need to refer to my comment on hammerspace if you're going to figure this one out.
There's also no justification for Eri choosing to criticize Tenma for making Eri look like the bad guy instead of trying to reconcile. Even Eri knew that was wrong. Yakumo was so offended by this last insult to her beloved sister that she snapped. I disagree with her action and expect it to have terrible if not apocalyptic consequences, but I do understand why she did it.
I don't care what she "seemed to show". We know her thoughts, and so we know otherwise. Even Tenma, who doesn't know her thoughts, is willing to listen. Yakumo is not involved in this issue, but she became violent. There's no justification for that.
Eri was doing a terrible job explaining it to her. From the sounds of it (with Eri thinking of what was most important to her), Eri wasn't even sure if she wanted to explain it to Tenma.
That's not the issue. Eri had a problem with what Tenma was doing, and she was explaining it to her. That's perfectly fair.
Two wrongs don't make a right. My point was that Eri was certainly in the wrong up to the point when Yakumo slapped her.
You might have been able to argue that a chapter ago, but she's already suffered for it, now. Perhaps you could have justified Tenma doing the slap, but Yakumo had no actual grievance here.
What exactly do you think Tenma is going to do? Kick Yakumo's ass? Scream Yakumo's head off? Stop speaking to her? Tenma will probably be too shocked to respond well, while Yakumo is more focused than she has been in the entire manga. If ever there was a time that Yakumo could stand up to Tenma, it's now, when she is defending Tenma from someone whom Yakumo probably believes is the very worst friend in the world at the moment.
Oh, but you forget. Tenma is at the core of Yakumo's vulnerabilities. Her behavior towards Tenma is in compensation for the guilt that she feels from their childhood. Tenma can have a devastating effect on Yakumo.
I really doubt that Eri will be able to resist retaliation of some sort. She still hasn't settled things with Tenma, so Eri won't find the idea of letting Tenma fight for her against Yakumo very appealing. Either a verbal or, in the worst case scenario, a physical counterattack is probable.
We'll have to see, next week. But one thing I know is this - Eri doesn't need to raise a finger, to get revenge. Yakumo's actions have placed herself in harm's way. There's no more fitting punishment then that.