Knife?

I find this online Ragister story somewhat confusing

Police: Popeyes Chicken robbed by man with knife

However, the story reads -- 

An unknown man reportedly leaped over the counter at a Popeyes Chicken restaurant and held the cashier at gunpoint while demanding money.

That's not a knife.

And the scientific community is united in that fact.

It had to be

That's the only possible explanation, especially if you consider the story continued with this information from witnesses -- He knocked down the cashier and when the suspect and cashier stood back up the suspect held a knife to the cashier’s side and demanded money