It was a capsize but then turtled. Also instead of yelling have the kids try to figure out on their own and give a bit of advice

I notice you released the rudder from its normal position in the rudder stock. Is that important? I find that the boat wants to turn upwind as it rights, and I have never tried releasing the rudder.

Students will learn quicker and better without some jerk yelling constant instructions through a bullhorn.

1 - douse the kite first, 2 - do as in 1. Dumb instructor never mentioned it.