They'll get schooled by range officers and other veteran shooters who observe such behavior.
Despite the huge number of guns and equally large number of inexperienced owners in this nation, the number of accidents is still pretty low, and most of those do not occur at a range.
The rates for all unintentional gunshot injuries are:
Fatal: 0.2 per 100,000
Nonfatal: 4.71 per 100,000
The majority of these injuries are white males between 15-50, though the rate is higher among minorites in all age groups. The highest rates are in the 20-29 age groups for all races and sexes.
Source: CDC 2011 Fatal and Nonfatal injury statistics.
Just glancing over the data, without really plugging in numbers, it appears that males are about 8 times more likely to suffer a firearm injury than females, which probably correlates directly to other statistics on ownership and handling frequency, though it could be due in part to women (in my observations) being generally less intuitive and more innately cautious with machines. They certainly take instruction better than men! I'll take female shooting students over males every day and twice on Sunday!