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if you planted a whole bunch of m-80's(as loud, if not louder than an ar-15 gunshot) rigged with some old fashioned battery/egg-timer fuses, placed them in secluded or hidden areas across enough floors of each building, all timed to happen say 30-60 minutes before the first plane hits, you could have both buildings fully evacuated before the planes hit. 1 day rep time is stressful as for you though lel