At the field I looked up to see a friends EDF producing a nice smoke line then I realized I have to get the camera since there isn't much I can do to help. I got the landing and the aftermath. He was flying on the second pass and noticed a loss in power. It was a 6s1p 5000mAh 20C Turnigy Lipo with not that many cycles. Not for sure what caused it but at least he had a separate pack for the receiver and servos so he could land it.