[Will nods, again understanding. Fortunately, Ken isn't the first teenager (or kid in general) that he's trained.]

Okay. I'll supervise you, but the most important thing is to have a steady and confident hand.

[He gestures for Ken to follow him over to where he keeps the sutures.]

There are three questions you should always ask someone with a head wound or suspected head trauma. Ask for their name, what's today's date, and if they know where they are. You're using those questions to quickly check for a concussion. Apply pressure to the wound with some sterile gauze to staunch the bleeding. You'll wanna keep them still and lying down, and come get me.

[Will smiles reassuringly at him before digging around for a practice kit. He definitely has at least one for this purpose.]

Seriously, don't worry if I'm already in the middle of treating someone when you come around to get me. I won't lose concentration or anything.