Now that we've dispensed of the red-herring shooting, it's time to get back to the sniper plot. We pan over deserted Miami cityscapes as assorted news reports detail how terrified Miamians are barricading themselves in at home; it's a lot like being in D.C. during the sniper attacks was. How convenient that this episode aired but a few weeks after the perpetrators were caught, so we'd all have the fresh memories for drawing those kind of parallels.

And now, another science montage. You can do this at home too, you know: put on your favorite dance CD, grab a micropipettor, and shake your groove thing while occasionally shouting out words like "serotype!" and "GSR!" Lord knows, that would be about as enlightening as what we're seeing on screen. At the end of the montage -- which features Horatio watching assorted things centrifuge, Calleigh shooting assorted firearms and marking measurements, and Speedle watching security footage -- Speedle comes in to tell Horatio, "I've confirmed that The Man In The Ice Cream Suit was inside the dry cleaners' two minutes before all hell broke loose." Horatio's fine with that, but he'd rather Speedle looked at his evidence. After beckoning Speedle over to a scope, he says, "The sand on the right is..." "...is a mixture of calcifying green algae and brown Swiss cheese-looking grains, uniform in size." "Likely from erosion," Horatio says. "Beach sand," Speedle adds. He then looks at the sand on the left, which was found on the rooftop where the sniper lay, and says, "Gastropods, snails, and football-shaped rings of benthic foraminither." Horatio comments, "Not homologous. I'm thinking from a quarry."

Calleigh checks in with her results too: "Based on the penetration test -- I used a gelatin block to reconstruct human tissue -- the shooter was 975 yards away." Nine hundred and seventy-five yards away? Why, that's nine and three-quarters football fields! Horatio's impressed by this. They conclude that the leap from six and a half football fields to nine and three-quarters football fields means that their sniper's showing off. If there's one thing they can't stand, it's a grandstanding killer. Horatio then shows Calleigh how "the sand in the shooter's sand sock is coral." Calleigh concludes, "So he practices shooting in a coral quarry." Or maybe, since he's gone to all the trouble of planning everything else, he's stuffing his sand sock with a completely different type of sand. Why is this hypothesis never raised? Horatio pulls up a map of Miami, notes the three coral quarry locations that are abandoned, then pulls up a chemical analysis that reveals the presence of jet fuel and therefore narrows the number of quarries down to one.