At the local park with 4 DC. DC1 suddenly projectile vomits while on the swing. No idea what happened, she says she feels fine and hadn't just eaten a big meal or anything. I've rung the council phone number that is on the sign, he says it's not an emergency so can't call anyone out at the weekend and to just leave it. I have 4 under 5 with me and no way of cleaning it but feel very unreasonable just leaving it. What should I do?!