Blades on the machine appear to rotate to the right. The machine is twin eng. An eng failure in the hover without enough pwr to hover OEI would result in rotor bleed and descent (explains the coning angle and yaw to the right as airframe yaws in the direction of M/R drag, ie at high coning angle t/r can no longer balance m/r TQ).
If the machine suffered a loss of t/r or insufficient t/r thrust in the the hover then it would yaw left (video shows yaw to right). Excessive t/r thrust fixed pitch would result in machine yawing right and continuing to yaw right unless collective lowered, pitch on blades indicates machine had high collective setting on touch down which indicates machine went right without lowering collective-Therefore t/r malfunction unlikely.
Hard landing may have damaged belly and underside of machine, floats etc, as a result machine started to take on water, CG changed (more weight in nose cone due water). Pilot attempts to fly away OEI while taking on water, aircraft capsizes as pitch is applied and nose becomes too heavy. Main rotor contact with water and airframe destruction results.
Summary-Aircraft conducting OGE hover OW, ENG fail, Aircraft now OEI with insufficient power to fly away from hover, RRPM decay, M/R drag increases and aircraft yaws right, co-incident with aircraft touching down with large ROD, underside/undercarriage damaged, aircraft takes on water, aircraft CG changes (nose heavy), Pilot attempts to fly away OEI as machine starts to take on water, Power available < power required, aircraft rotates foward-M/R contact with water-Resultant crash....
My 2 cents.
Condolences to family members
Lasty
