"Others may try, but as long as you are in my charge, none will get any revenge." Furious as she is, sick with worry as she's rapidly beginning to feel over Sans, she's a goat woman of her word. Her track record isn't the best on protecting anyone or anything, but she can't help but try.

And for now, that means a fiery cage. To keep him in and others out. Perhaps with the children, she had never used her full strength, but she's using it here and now.

"Now, we find you somewhere to calm down and think on what you have done. Luckily, death is impermanent here. Perhaps you can find some way to make amends to others here in the castle. If not... then we shall simply have to become quite familiar with one another, shall we not?"

Toriel has never wanted to be a jailer. But if it means keeping everyone safe, she's hardly above self-sacrifice.