Should someone walk into your business wearing a ski mask...Expect trouble.
Two young men wearing ski masks walk into a smoke-shop in Las Vegas (and a 3rd holds the door open) obviously looking to rob the place. They get asked to leave by the owner. One grabs the money in a tip jar and the other jumps over the counter (probably to grab merchandise) when the store owner quickly pounces on him jabbing him several times with (what appears to be) a small dagger. He goes down and the other 2 run away.
(so much for partners in crime)
Stated in the news TV followup, the door will be fitted with a buzzer to restrict entry.