It's the skiers fault and the damn parents fault if they were there. God damn parents need to keep their kids out of the big parks! Someone is bound to get seriously hurt or worse when you have a swarm of little kids weaving unpredictably between features when they have no business even attempting any of the features. Then the parent complains that we're the reckless ones when their kid gets landed on, NO the parent is the reckless and irresponsible one for even going into the large park with the little kid. They build progression parks for a reason.
As for your situation, if the doctor says no go I wouldn't risk a serious brain injury. In this case I would say the risk outweighs the reward.