Gabe blinked. That changed everything. Well, not everything; the skin would probably still be the best barrier to define the ward, and tattooing was probably even better, the visible element serving the same way the lock on a prison door was always on the outside. For containment, probably you could leave scope for strength by getting extremely specific, in fact you'd have to, otherwise it'd fuck with magical healing like cr--
Hang on.
"Hang on, are we talking about you?" When Gabe spoke, William's chin came down, looking wide-eyed, with a faint flush high across his cheeks, and looking all pretty and startled was not distracting Gabe from this one. "We are, aren't we?" he demanded grimly, but William was just so distracted that Gabe couldn't help a glance up, even as he kept speaking. "What is it that you're--?"