he was there, and aside from underground explosions long before tower collapsed - the stairways were blown up and the lobby was destroyed. his interview corroborates with the groundskeeper who saved his life, willy rodriguez. they had to escape using the only stairway that had not blown up - a maintenance stairway that only willy knew about.
also, in his interview he talks about trying to find a way out in the smoke, and stepping over dead bodies and finding a dead body in a closet.
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