WTF just happened?...

This afternoon I went to a local store like 2 blocks away from my home to buy some tostadas, usually this store has its doors closed as a security measure, but not today, when I opened the door it felt weird since I always have to ring the bell or knock at the door, well, I didn't care about it, but as soon as I picked other things I had to buy, a guy got in gun in hand. I saw it before he began to threaten us but I didn't saw his face, just the gun... I didn't understand what he was saying (maybe because he was stoned and was talking weird) but I got on the floor and lay there with the owners son and another customer.

He then made the owners son open the cash register and he got all the money he could and ran away, lucky for me and another customer he didn't robbed us and we didn't got hit or anything... well, he did aim the gun at me when I was standing, , but dammit I was so pissed, and I didn't get a chance to see him, I only saw the gun and I wasn't going to risk myself for a few pesos. And besides, the owner he has a safe-deposit box where they put part of the earnings for this kind of situation, so it wasn't a total loss.