13 yr old has heart attack rounding the bases

[JR12]

Most states have some sort of Good samaritan law. In MD if you are not a professional care provider and you are trying to help you are not liable except for cases of GROSS negligence.
I am an EMT and CPR certified, so in a case like this would be required to act. Luckily I havent run into anything life threatning, so if some ice, bandages or stitches are all the player needs I stand back and let the coaches and parents take care of things. I may give my advice and usally reccomend a DR or ER visit.
Most 911 centers have an EMT or Paramedic on duty to tell people what to do and how to give CPR until help arrives. If your not trained, doing something is better that doing nothing.