Someone commented on another video that they saw the Ram Air Turbine extended. So they would've lost power, supporting your electrical fire theory. Also it seems extending the RAT disables some safeguards, that can cause the wheels to lock and catch fire.
The other video: https://youtu.be/EPiNC5JpEYs
My Mikrotik routers and switches also reboot in seconds (even for upgrades), which I've never seen consumer gear do!
Even my Ubiquiti switches seem to take a minute or so to start forwarding traffic after a reboot; whilst my Mikrotik switches reboot faster than any of my unmanaged switches start up.