It seems strange to me that there aren't any other scuffs in the regolith made by the rotors when they supposedly hit the ground.
Here is a theory:
• The blades disintegrated in mid-air.
• The scuffs we see were not made by the rotors but by the helicopter's feet; it dropped fast, bounced, and then landed at its final location.
• The disintegrated blades spread to pieces so they are not seen around the incident, except for one which flew south, almost intact.
Crude animation:
