So, based on these frames at the moment of the RUD, it appears the engine is on the left, as that's where the explosion starts, and up that point the plume to the right tapers off in brightness.. in other words the engine is "firing" to the right:
View attachment 1014828
View attachment 1014831
However, in the frame to the
left of the engine, as thrust picks up, you can see atmosphereic distortion and actually some exhaust flame shortly before teh explosion:
View attachment 1014830
What are we seeing here? is there some sort of ducting or other mechanism to redirect the exhaust? I don't see a dirt berm or anything...