Why are you wasting your time with him? Ask him some serious questions and see if he can explain them. How he responds will be laughable - that's why I ignore him.
And the explosive residue that would have been overwhelming as it is with a friggin' firecracker? All disappeared? All evidence carted off, washed away, etc. even though that never works even with a small house fire?
I love 9/11 loons.....don't have the faintest clue about forensics. :)