I stumbled across a few videos of Scott Reitz on Vimeo, they are pretty good. Reitz is paired with a young shooter in a competition of sorts. The young man in the video is quite annoying and Reitz takes it in stride, eventually teaching the man a few things. Seems like a great instructor, and there is a good clip of him running an 870, and some other mindset notes. If you look at the profile of the person who posted the video there are several links to versions of this video, different cuts.
https://vimeo.com/40112336