If it was a mid-air then planet Earth is not the proximate cause, just a destination.
Looking at the photos, the red one shows little damage. Pure speculation follows: if it was a mid-air, it's possible the red helicopter's skids came in contact with the blue helicopter's main rotor blades. In the video it sure sounded like there was something messed up with the blue helicopter's main rotor. The blue helicopter is, sadly, doomed. Meanwhile the red helicopter makes a rapid precautionary landing. Perhaps someone more skilled at video analysis can determine if the left skid was still attached to the red helicopter as it flew past.