In the unfortunate event that someone gets injured OOG, I'll be toting an OOG supply of instant cold packs for this purpose. I request that you please notify a staff-official EMT if you are injured or see someone injured, but please also feel free to ask me for cold packs.
Disclaimer: I'm not an EMT and can't help with the injury, but I'm usually around people and can dispense packs while actual help is on its way.