I thought our hero was involved in the bombing as we never saw what was inside the case when he stopped the chap and asked him to open it.
Btw - Huffington Post has a list of questions about each episode - and the above is mentioned.
But surely not ? ........ ? !
I don't think the bomb was on the man with the case, he was just standing there. I reckon the bomb was on someone in the front row seats and the woman guard spotted them and ran forward. Our hero put himself in danger so he's innocent