Lets just face it, the School for Evil is a pretty damn terrifying place to be. All the students are hideous, you're encouraged to do cruel, nasty things, there are prisons with better food, and don't expect any emotional support from the staff.
What the Gavaldon Elders did when they said they were going to move Sophie for her protection. They cut up her hands and wrote a message to those attacking the town that they could have her on her dress in her own blood, and left her to die.
Tedros' entire situation in A World Without Princes. He's trapped in the former torture chamber, which has become mostly just his torture chamber, Denied Food as Punishment, and when Sophie sees him there isn't a mark on him, but he looks broken.