Depends what type of injury it is.
Jack off!
It depends on where the injury is and how severe it is. Before working out with any injury you should talk to your physician or trainer.
Whoever caused the injury should be held liable for it. If your friend did something reckless, which caused the injury, then your friend is solely responsible.
You should go to a sporting goods store.
Browning
yes
A person with a serious leg injury should not be allowed to walk. It is also true that a person with a serious head or back injury should not be allowed to walk.
An injured student should see a sports injury professional if rest is not taking care of their injury. You should also see a sports injury professional whenever you have severe pain after working out.
macaroni and cheese
There is no age requirement to purchase tickets to sporting events. Your son should not have any problem purchasing tickets.
Get a Personal Injury Solicitor to help and defend you.
Yes you should use a AED on a person that has a electrical shock injury.