In our system of civil tort, pretty much anyone can be sued for pretty much anything. “Often”? No, I don’t think so — and winning even less so. But being involved/accused of such a claim will be a hassle and may involve legal expenses to make your affirmative defense before you can move on.
As @BRUCE26 suggests, Goggle the good samaritan laws for statute and case application in your state. Most often the scheme works something like:
- a person with no duty to act (i.e. not your paid or volunteer reason to be present)
- who attempts to assist voluntarily in an emergency (i.e. no billable hours)
- and acts appropriately within the scope of their training (i.e. no doctor interventions by a paramedic, no paramedic interventions by an EMT, no EMT interventions by a first aid or untrained person*)
- with the resources available to them under the circumstances at the time
- who makes a good faith effort as a reasonable person with the same qualifications would in the same circumstances
will not be considered negligent or responsible for a bad outcome by attempting to help. Which does not mean that a party with a grievance can’t or won’t claim that your acts failed one of those qualifications. And your jurisdiction might have added requirements or less clear criteria than the ones I listed.
Consider also that, if you stand back, the same party might try to claim that you did have a duty to act, or did not act as a reasonable peer. Just like with DGU, there is always risk no matter what path you choose. Make the best choices you can, make your best effort at whatever you choose, and hope to prevail.
*note that no amount of purchased medical equipment, morale patches, or YouTube videos will increase the legal scope of your state or nationally recognized level of training.