And you’d bet your life on that gut feel? That seems like an incredibly bad idea to me.
In the specific incident caught on video? I doubt it - there was a guy tackling the gunman before the cop even reacted to the gun at all, and he had his hands on the gunman’s hands, so at that point joining in the tackle would actually be easier than getting a clear shot.
But in the general case, if you point a gun at a police officer, I expect that you will be shot, and I don’t think that’s a huge issue or something. Expecting police officers to let someone point a gun at them just on the off chance that they are bluffing is a ludicrous standard.