Not the lasers - that's why the Space Spiral and Giant Wheel close. Iron Dragon and Wildcat close because those big green boxes (on the ID lawns and inside the Wildcat) contain the huge blast fireworks (for the end "America" part of the show). It wouldn't look good if one of those misfired into the ride and it was still operating. :) The two coasters cannot reopen until they have the all-clear from the pyrotechnics people that the fireworks are safe. This is also why no one is supposed to be on the inside of the ID fence or on the WC entrance/exit ramps during the show.
One time, a guest was trying to camp out on the lawn just before the show (sitting next to a box, no less) and refused to believe me when I told him the fireworks are in there (please, if you're mad at a ride op, don't use foul language - it isn't very nice...). I wanted to tell him to take a good close look about 10:23pm and he'd find out. I wanted to, but I didn't... ;)
'98 Iron Dragon Crew
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/ ** Updated April 4, 2001 **