Tangentially related:

How do you think Remus would have felt once he was back to his human form if something had happened to Snape?

Or even just how he felt knowing that Snape had found out in the first place! I mean, there's a reason that there was a very small group of people that knew: Because, matter of fact, people in the Wizarding World have a, oh what do you call it? Oh right, a prejudice against people like Lupin. And, hum, if I'm not mistaken there was an entire book where the secondary story arc was all about Snape trying to take advantage of this prejudice to get Lupin fired. And succeeded.

Because . . . he's a lovely, wonderful, caring person who's only looking out for the kids' welfare. Or something.