Imagined backstory: Kira and Azrael were sparring.. using weapons, because they're both pretty much matched in agility without weaponry. No padding for kitsunes, although if they use blades they are typically dull blades (but more likely just metal rods or wooden weapons).. they recover quick enough that uuusually it's no big deal if they get whacked.
Then there's just bad luck - Kira would never have meant to harm Azrael, but she can't stop him from holding his arm just a little off-kilter and it getting a bone fracture as a result.
(I know that's just bandage and looks nothing like a splint. Assume there's a brace on the invisible side of Azrael's arm because I'm a lazy bum and had to rush to finish this at all. >_>; )
Kira Tombin, Azrael Tihomi -- myself (Absolute-Sero)
For the ea-lec weekly prompt "broken".