"As the sun goes down, the volcano will erupt as it does during the day, but this time it will be more powerful/violent. As the geyser erupts, this time it's "lava", not water. As it cascades down the mountain, it turns all the water in the park to "lava" (done with LED lighting and stuff like that). At this time the park's background music and effects change to match the new "dangerous" setting"