Finger off the trigger, pointed in a safe direction, and not a gansta grip.
This is just one still shot and maybe just a fluke but it stood out to me. This guy probably knows his way around a pistol, at least a little bit. Looks like a Glock to me, but I could be wrong.
Hopefully they catch them soon and their success (so far) doesn't lead them to trying it again. I always carry when I have to go into the bank, and I try to be very alert. I prefer the drive-up teller, though, so I can avoid assholes like this.