hard landing + excessively high AoA = tail knocked off; landing gear failure one side.
thats my armchair guess absent any and all facts.
Landed short of displaced area that is short of the runway threshold. Pilot tried to pull up rather than add power. Airplane stalled, tail dropped and hit the bank prior to displaced area. Tail separated from aircraft. Pilot no longer had any control. Plan skidded of runway. My opinion? Pilot error!