Looks like someone defeated the overcurrent device on that generator. If it had been working properly it never would have smoked the genset windings.
Pretty spectacular stuff but there is something wrong with that video. I cannot forsee any kind of force that could be applied to a generator that would make it jump like that short of an explosion or earthquake. Ive even witnessed "arc flash" experiments where a 'bolted fault' (short circuit) was applied to a generator of about that size, it dident jump, it dident 'shake', it 'sagged' or bogged down for about 10 cycles (1/6th of a second) and shut itself down. But that bolted fault (a large switch) went up in a huge flash, bang, and puff of smoke.
Id like to consider myself an 'expert' when it comes to power generation distribution and control, its what I do for a living.
Not to dismiss the concearn, the grid could be overwhelmed and shut down but your not going to see generators exploding. Besides generators are (with some excpetions) a standby power source and are in no way connected to the grid. They are physically isolated by a transfer switch.
The generators that you get power from when you plug in your toaaster are very different animals.
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