Timing of the mugging is labeled out in the rules,
Likewise you may only make realistic demands, this means you can’t demand something unrealistic that the victim cannot deliver in order to kill them. Give them a realistic amount of time to comply. Don't order them to do something then shoot them < 5 seconds later, they barely have time to comply.
In the clip, the moment they start saying "Stop moving" to the point they start shooting him is about exactly 5 seconds - he asked why about the same time, which I feel they could've easily responded "Or you're going to die," something a long that rather than relying on Tommy to notice guns that were on safety be switched off as he already was walking away - in the dark.
+1