Looks like the pilot and spotter were doing their jobs, up to the point of the "photographer" sneaking out on the over-run. He probably thought that the models don't land all the way out in the grass, that they're all under control. The swept wing 747 model looked a bit hyper in the "dutch roll" phenomenon and the control inputs in the landing flare caused a real big roll series but he did well keeping it together and touched down well, and probably would've rolled out nicely until he hit the "photographer".
I saw another You Tube beauty where a guy is landing a fine scale WW1 model and his buddy just walks out behind everyones view and gets whacked during the landing roll. Beats up the model and there were plenty of "what the **** were you doings" on the audio.
No matter what, when flying models there are people there that don't get it. You should see it at real airshows, and some are the participants. Often it's too ugly for words.
Chris...