This vote seems weirdly lenient to me. Not so long ago our response to this sort of crime would have been "sacrifice them all", and now we're treating them with kids gloves?
They know that we're a crazy powerful Sorcerer-King who keeps devils bound, presumably with our mighty and terrible magicks. And so they figure they can bind devils without being able to cast a single enchantment spell capable of affecting an imp, relying on nothing but social skills and threats?
No, they're incredibly dumb people who knowingly comitted an extremely serious crime. They even know all about how bad devils are, it's literally part of thevery same education that taught them how to summon an Imp!
...
Actually, why are we teaching Scholarum students to summon Imps? It's not like it's knowledge they need, beyond "here are the reagents that devil-callers use".
You'd think that functioning Imp-calling rituals wouldn't be available to them.
EDIT : To be clear, I find this incident believable. I just want to know if we should be investigating where they got the ritual or not.