Elementary
I've watched plenty of explosions in slow motion and this one is remarkably simple! I don't see what the fuss is about:
1) It happens rapidly from a single small point in a single frame
2) You can see debris heading out in straight lines from the origin of the explosion
3) The main combustion/explosions come much later.
So it was a small perfectly mixed fuel and oxidant mix right at the externally accessible fuel line with its own detonator AKA a small bomb. All you need to do now is rewind the tape and watch the last person to touch the fuel line and see if he has a French accent or works for an evil corporate. I don't think the explosion is complex, the only question is which of many groups has means, not just motive.
Biting the hand that feeds IT
