The tree of life is self pruning.
Yes, danger of arrest.
.20 BB is not dangerous from any distance so long as it's under 400fps. 400fps would really fucking hurt at point blank, but it won't do much more than break skin.
Eye protection is very important, eyes are very delicate, and the eyelids do nothing for a bb impact. You will need ballistic goggles / glasses, or paintball approved goggles.
Stay they hell away from that game, and call to confirm with the land owners before the game takes place, they could be risking the eyesight of other campers.
Ár skal rísa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.