I just completed the on-line RSO class (long story, but someone wanted me certified and was willing to pay for it).
The class was decent, but I think it's unfortunate the NRA is choosing to milk its online courses as cash cows rather than as a service to members. $125 to look at a couple hundered slides with audio narration and take an on-line exam to earn a PDF certificate is in my opinion a bit steep, and will discourage people from taking this class.
I always use to think that if there was an injury on the range that the procedure was to call 911 and render first aid. Now that I have taken the course, I know the procedure is to refer to the range SOP and call the emergency number listed in that document
.