"Well they did change up the basic combat training for army folk recently to include CLS. However for the Air Force," and he finally drops his finger, tries to hold his light at a reasonable distance for the LED and watches Ianto's pupil response. "At basic training we do first aid, you know, we get the mental health awareness talks and stuff alongside cover and ethics and arms training. The reason I know you don't have concussion, however, is because I flew rescue missions."

Which, theoretically, Ianto knows. He snaps off the light, puts away his phone as he studies Ianto's expression. He's irritable, but it doesn't feel unusually exaggerated. He's been hit in the head and they've had a bad day, a certain amount of irritability is pretty much on point. John can keep an eye on him anyway, in case he's wrong.

"Don't take any Advil. Nothing with anti-inflammatory properties. Whatever passes for Tylenol here is fine. If you start feeling confused, like you're gonna vomit, or your headache doesn't go away let me know."