How many explosives does it take to implode a 20-story building? What's the best time to do it? And who gets to push the button when it's go time? In Part II of Demolition Man, Mike Dokell, vice president of demolition for Cherry Cos. shares stories from his 30 years tearing down Houston office buildings, hotels, and one of the messiest jobs he ever had, imploding the former Macy’s department store downtown.