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So, my uninformed analysis :tiphat::
1) there's a vent valve that is pulsing just after liftoff... tank overpressurization? (could be nominal)
2) exhaust changes color and brights a lot just before the "BUM". Seems to indicate a change in mixture ratio to the LOX side, hotter combustion, metal melts....
Not sure how/if these 2 observations relate to each other.
I think that vent pulsing is nominal. That's the first thing I noticed on the replay (thinking O-ring, etc.), but I looked at an earlier Antares launch video and saw the same thing.
I was surprised no launch self-destruct occurred. Maybe it was too low?