Students first jump via IAD method. Right after opening the main was spinning and slider up. Student was told over the radio to pull both toggles all the way down and let them back up. Still spinning with slider up, the jumper was told to cut away but he didn't. Was told over and over to pull the red cutaway handle. Student finally did so at about 1,000ft. or lower. Reserve pilot chute wrapped around his arm but still started to deploy the reserve. He impacted with the reserve just leaving the bag and beginning to snivel. AAD fired at some point.

Post inspection of the gear saw that only one brake had been released on the main.