The seal was supposed to seal away the demon at the cost of his own soul. And that's what happened. Really. Do the details honestly matter that much?

[These are the moments that define you, seconds that are eternities, crouching on water like it is glass and waiting for your prey.] In ANBU, there is no need for banter, or names, or even faces. There is only the fight. One-shot, complete, rated M for violence (just in case).

Some things are well-known about Hogwarts and Magical Britain. Other things are... less so. An experiment in head-canon, crossovers, and history. Written in twenty truths format.