Your question does not have enough information in it.

From other posts you have made, you fly helis. There is a safety code rule that requires that no flying take place within 25 ft of people. If the centerline of the runway is only 25 ft away, it would appear that you are in violation of that rule from the get go. If what you are talking about is a field where IC engines are being used in planks, I have to wonder why you might describe an accident as unforseen.

On the other hand, if this is a field being used for only 8 oz park flyers, you may get other answers.

If your question is serious, call Carl Maroney at AMA HQ and ask his opinion.