hard to tell from the different clips they have on here - was there more than one bad guy? Did the BG with the knife have a spotter in the store with him - the guy with the glasses and baseball cap too?
There's that 1+ rule again... assume there are multiple BG's and multiple weapons to address.
this is a classic hostage scenario. unfortuantely compliance by the victim does not always mean they survive. some resonable options exist for someone who is well trained.