[baD]

Spinning the wheels while waiting to be marshalled is a big no no!
Most BRCA sections have a rule re moving parts like spur gears being covered by the body shell, for safety, same for revving car wheels while crashed.
The kid above who just held it and refused to try to put it down did right.
Most clubs in my area gave out Marshalling notes along with memberships in years gone by (not so many now as new members are fewer) and this included 'do not touch cars while they are spinning the wheels'. I have placed a car off track on it's back due to this.

I believe 1/10th Nationals & some Regionals give penalties for 'bad marshalling' so no reason not to do the same at clubs - if it is spotted, penalise it. Some won't be spotted but that is not a reason for not having the rule.