Or just leave her alone until she's done.

*Mexican music plays*

I doubt she'd instantly push him away if that was the case.

Excited because seeing your partner masturbating is hot

I have to be honest and say that I disagree. People look idiotic while masturbating. To be fair though, people also tend to look fairly moronic while having sex as well but at least while you are participating you can't really see how stupid you both look. Watching someone masturbate or being in the same room watching other people have sex, is mostly just awkward and uncomfortable. If I'm not participating, I'm not watching.

Uh how does that make her an awful person? You don't need "permission" from your husband to masturbate, or from your wife for that matter, even if they're right next to you.

They're married. It's actually pretty fucked up to masturbate next to your partner and push them away. Like why the fuck are you even married at that point?

It's not about permission. It's about respect for other person.

I disagree entirely. Occasionally people just want the orgasm and don't want the work that actual sex, oral or otherwise, includes. If the wife isn't particularly feeling like being pumped by her husband, and isn't really in the mood to return the actions, it makes perfect sense that she would masturbate and not want him to participate. She knows that once he gets involved it is unlikely that she is going to get to just have her orgasm and go to bed. If he gets involved he's likely going to want to cum as well and then he's going to be annoyed when/if she just wants him to finish himself off by hand. Better to cut him off from the start then to essentially cause blue balls.