For any professional athlete in a sport, psychological quality is very important, but for shooting competitions, it is especially important.
Just a slight difference can change the outcome; on the Olympic stage, a few tenths of a point can directly knock someone down several ranks. Although IPSC scoring isn't based on points, differences of one point changing the champion are not rare in a competition.
Everyone who makes it to the competition is a master, but being ahead by fifteen points would have to be a massive gap.
In theory, Bill's psychological quality should be very good. As a shooter, remaining calm at all times is the most basic requirement; however, not every professional shooter truly possesses good psychological quality.
There's a true and heartbreaking story about a professional shooter named Emmons.