A paint ball shoot is not a safety issue.

Doing this is certainly no worse and in my opinion significantly safer than RC combat or pylon racing, just to name two long running RC events with good safety records. Zero fatalities in RC combat ever and two or three racing related fatalities many years back in various forms of pylon racing. Pylon racing safety rules have improved since those long ago accidents.

You are at more risk driving to the flying field than you are from an RC related injury accident.