Heavily Warded Owl to Seamus Finnigan Mister Finnigan,
I felt it only fair to warn you of something, since I doubt you've considered it in whatever calculations you've gone through.
I know the deal between you and Draco Malfoy. It is not something I was particularly happy to hear about but it is Draco's decision. I also know all of the various things I've heard about you, and what of those I know to be true, which makes me wary of his putting trust in you.
Just know that when he says out, he's out. And that if you do anything to hurt him or lost the bit of freedom he has--you will certainly regret it, of that I can guarantee you.
Do not think that just because he lacks a wand that he lacks true protection. A person protects their friends, and you'd do well to remember that.