[Although Squalo has a tendency to be loud and...expressive, Robin can recognize when something really bothers him. At least, he thinks as much tends to make itself rather readily apparent even when it's more yelling that heralds it.

He's rather flying off the handle now. Or the hilt, as it were.

And while this concerns Robin, he does make an effort to remain calm - it's important that he address this and not escalate matters]

It would be needlessly invasive to do either of the things you've described. Nor do I think that it would do very much for any level of trust, which is another problem.

[Because if Squalo can't trust him further than he can throw him, that's a pretty big problem when they're supposed to be something of a team. All of them are]

What I've written down is the product of analyzing existing texts, and things I've happened to observe.