First of all this is my first post on this site, have been a lurker here about 3 weeks.
I am very big on personal responsibility. It is my weapon, and in my control. Having said the above I am going to make some assumptions that I will lay out.
Assumption #1, it appears that the SO in question was working this stage only. As opposed to the SO traveling with the squad or the "fill in" SO from the squad. I define Fill in as an experienced shooter who trades off the SO duties with other experienced shooters during the squads performance/shooting.
If we accept that premise, the SO had better know the stage and more importantly the pitfalls of that stage better than the shooter.
Assumption #2, I see from another thread that peeking around a barricade or looking around the stage for sight pictures while "pasting" is a big no-no for the shooter, and some of the folks who have commented on this thread commented on that thread as well.
Assumption #3, The shooter is an experienced shooter (not by classification, but by safety and skill levels).
How can you blame the shooter, who is looking to place well aimed shots on his targets, who may not know the location of all of his targets, as we all agree this aint USPSA, for the SO's absolute failure to be in the appropriate place. The shooter did not do anything wrong. The shooter should have the reasonable, and I am NOT a lawyer, but the reasonable expectation of the SO staying out of the way. NO DQ at all for the shooter. Having said the above I am not a certified SO, but do SO local matches.