I don't see that either. It doesn't look like there is much time that conversation goes on between the cop and Crawford, if any at all. Just based off the video, it doesn't look like the cops said anything, they just shot. But, if you listen to what Crawford ' s girlfriend says. She states that before he is shot she hears him say "it's not real"(I assume he is talking about the gun). So then it does appear that a conversation went on if only for a few seconds, maybe a little more. The video looks one way, but the cops could have made their demands, and Crawford acted a little stubborn and defiant and didn't do what he was told like a lot people who get annoyed by police. Maybe he didn't understand the severity of the situation and delayed listening to the cops demands, prompting a trigger happy unknowing cop to take action. . I dunno, I'm just pondering the possibilities.
I would like to know some more details about the case that could shed some more light on the situation. Like when, how and where he was shot. It's not completely clear. Also it would help to hear some clear audio of the event so we can know how much warning the cop gave.