Skydivers are about to jump when another plane hit their plane

What happens in this video ?

November 2nd 2013 - Superior, WI, USA – Midair collision between two aircraft carrying 9 skydivers and 2 pilots. The collision has been captured by the skydivers’s helmet cameras.
The in-trail aircraft, a Cessna 185, encountered wake turbulence from the lead aircraft, the Cessna 182, which caused a midair collision and subsequent inflight breakup of the lead aircraft. The lead aircraft was destroyed and the Cessna 185 landed safely having sustained damages to the propeller and to the wing. All the 11 people onboard survived. The pilot of the in-trail Cessna 182 received minor injuries.