VTOL Failure at landing (Nimbus VTOL)

Hi everyone,
We had a pretty bad crash with this plane checking at the logs with FlightPlot I think it might be because of a failure on the Front Left Motor RC6, but would like if some one else can confirm it.
Its running a custom firmware version of PX4 by UAVenture. (no more AUVenture support by now :frowning:

Plane details:
Nimbus VTOL Tricopter tilting rotors
Battery: Foxtech 22Ah Solid State 6S
Mauch Power Meter

RC5 Front Right Motor
RC6 Front Left Motor
RC8 Tail Motor
RC9 Left tilting servo
RC10 Right tilting servo

LOG Download

Thanks for any advice!