I was thinking about this because I rewatched the break-up episode and Reigen's words had always caught me a little off guard when he said all that stupid shit to Mob, because—and yes this is the point I suppose—he's never usually that harsh with Mob. Because the rod isn't what Mob needs, and Reigen knows it, and he usually tries to be the best shishou he can be whilst still lying to his disciple about everything else :'D So I considered Reigen insulting Mob and going after his friends to be largely out of character for him!

But, I realized that the series focuses so much on Mob's inner struggle that we don't get to see a lot of Reigen's. And for Reigen, who has had Mob all to himself for close to three years, the sudden influx of people taking Mob's time and attention would've been highly alarming and disquieting to him. Because for literal years, Reigen was the village raising the child.

Before the series started, Mob and Ritsu were still distant if loving. His parents don't seem to make much of an impact on is life either. And before joining the BIC, Mob had no friends either. He just kind of,,,existed. The only person he could've considered a friend was Reigen. Reigen gives him advice and life lessons like a parent, jokes around and heckles him like a friend, and scolds him when he's being dumb like a mentor. Reigen didn't raise Mob (he does still have parents for that and Reigen has only known him three years out of fourteen) but before canon he did seem to have a great deal of control and say-so over Mob's life.

And yes, again this is bad. It's unhealthy at best. But Reigen's options in the beginning were either fire Mob and send him away so that wouldn't happen, or keep him by his side and encourage him to make friends as they went along and Mob learned more control and social skills from him. The latter might've even been Reigen's original plan once he realized he actually likes Mob as opposed to him just being a random kid. But then, of course :) Reigen gets attached :)) Too attached, even :)))

Enough so that when the time comes and Mob actually DOES start to make friends, Reigen feels deeply threatened. Fondness has blossomed out quite nicely into codependence, and now Reigen—who is also deeply, incredibly lonely—cannot imagine a life without Mob in it anymore. He doesn't like the thought of Mob drifting away. Outgrowing him. So he opens his mouth and puts his foot directly inside, trying to alienate Mob from his friends and secure his spot as top friend dog once again. (Honestly as if there was any question 🙄).

Thankfully, Mob nips that shit in the bud IMMEDIATELY. Because again, he's been with Reigen for the past three years, and other than some of the other bullshit bout spiritual powers, Reigen has been largely very wise and helpful when giving life advice. It was very likely his OWN teachings and words about being wary of being manipulated and conned that helped Mob recognize it that fast.

So Mob leaves, and Reigen...crumbles.

Damn near instantly.

He tries to convince himself that he doesn't need Mob, that he's fine without him and that he never even cared about him in the first place—but later we see that the idea of Mob leaving him for good makes him actually, physically nauseous. That moment in the alleyway, with the moths around the lamp as my witness, was a moment of death and rebirth within Reigen's psyche. Again with the moths there that might be obvious lmao. The singular moth dying there might even be a reference to the fact that only one of Reigen and Mob's relationship problems have been addressed (and somewhat?? solved?? at least in the way that Reigen has acknowledged the need for change in himself on this front).

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