From the video it looks like the stages failed to separate and the rocket started tumbling. I'd expect the range safety officer to trigger the self-destruct at that point which would make the explosion newly scheduled rather than unscheduled.
From the video it looks like the stages failed to separate and the rocket started tumbling. I'd expect the range safety officer to trigger the self-destruct at that point which would make the explosion newly scheduled rather than unscheduled.