[Erasmus]

When asked if he believed Hinrichs meant to enter the stadium with the explosives, Mauldin said, "I don't believe he intended for an explosion to occur at that spot (on a nearby park bench)."

In the immortal words of Dr. Peter Venkman, "I'd call that a big YES."

[Tunehead54]

"Someone saw him fiddling with it (the backpack) shortly before the explosion occurred. I think he got cocky, and it went off," Mauldin said.

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I believe he went to the stadium, was going to drop off the backpack (with timer), saw he wasn't going to get through security, turned around and didn't quite have time to defuse his bomb. Luckily. ;-)