Thanks Gambit, ynnoj, JungleSkip, and Felipe!
It's hard to tell in the photos, but you can see in the video that the water in the fountain is actually shooting UP and into the upper level. Didn't expect that. Very cool.
And in regards to the operation of the HE when one park closes before the other, it seems the most logical that, in that case, all rides would be round-trip. There would be no one to board at the other end since the other park is closed. Passengers wouldn't even have to disembark. Just remain seated and the train would start moving again.
In other words, when one park is closed, HE would essentially become a traditional ride where you load and unload in the same place.