I went back to check the original video I saw when this happened from USLaunchReport and it's on there too, the (above) link does say that the object flew by, like after the initial explosion it shows the object on the other side of the rocket. I don't believe this part to be true, I think that was debris, which would mean that something was "flung" into the rocket making it explode.
Not quite as juicy as aliens, but still possible sabotage.