Super human physics: Iceman blocking bullets

In many movies we see super heroes creating walls of ice to block explosions and bullets. How realistic is this?

In the Incredibles Frozone shoots ice at a police officer just before he shoots a gun at him and blocks bullet with ice in midair.

How much ice is needed to block a bullet? What flow rate(volume/time) of ice would Frozone have to shoot to block a bullet midflight? How fast would the ice need to travel to intercept the bullet? Are there other side effects?
What else can you do with those capacities to shoot ice?

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Super human physics: Iceman blocking bullets

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