Nice job holding up the fort while I was at work, Ajax. I quite liked your post right before this one. I don't need to reply to as many comments, as a result.
As for Eri, I never said that she was going to apologize, just that she was on the verge of saying something important; be it an apology or venom-laced words. You’re putting words into my mouth to justify your belief that I’m wrong. I don’t mind if you disagree with me or believe that I‘m wrong, but at least pick something I actually said to disagree with.
Suppose Eri was going to apologize to Tenma; in this scenario, Yakumo clearly prevented, or delayed, a reconciliation between the two.
In neither scenario is the slap helpful, if you think about it.
As for me, when I said that there is no evidence to confirm why Yakumo slapped Eri, I meant that we can’t be sure why Yakumo got angry.