(Im going to say that this is more of a controlled emergency landing than a crash.)
I heard the engine make a weird "distressed" sound and also watched the the A/C shimmy a bit. I figured that wasn't good and that I should set it down to see what was going on.
I cut the throttle way back back for fear that I was having a brown out, due to a dieing battery, so that I could keep the control surfaces working.
Just as i was about to land, at about 5-8 feet of of the ground and right when I killed the motor, the motor fell off of the back of the A/C!
I was still able to slide it into the grass but it was still quite the "WTF?" sort of moment.
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I didn't put thread locker on as I normally due because I was still dialing it in and thought I might need to take it back apart. Also, because LW'PLA is soft, I was perhaps too cautious about how tight I torqued the screws.
Luckily there was no damage and she should be back in the air in no time.