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Shooting scene and the man was back. >> dressed all in black. i want to say a black helmet, definitely a black gas mask. he had also -- it looked like -- i thought it was a toy rifle strapped around. >> reporter: it must be a stunt of some sort, thought dave. >> he threw a canister into the audience. i thought, okay, cool. then it went off. i realized it wasn't a firework, it was an actual canister of some toxic gases. >> reporter: that's when it dawned on him, that was a gas mask. and from the tear gas he realized this was no stunt. >> as soon as the gas canister went off, people were screami...