[He is absolutely relying on Soramaru. The Yamainu aren't here--they haven't been here for the five months that Sousei has been stuck here. That means that there are only a precious few he can truly depend on.

Naturally, Soramaru is one of those people.

That said, he sees that expression, but at least he snapped out of it--so his remonstration is mild.]

So remain focused. This experience seems to be mostly harmless, but there have been significantly more dangerous ones. [Ones that even Sousei considers to be extremely dangerous, so...]