From my limited experience, you can move around inside the blind and talk to your buddy when the geese are not flying. However, when geese start coming in toward the blind, decoys, or whatever you set up, you need to be very still and not talk. You only move when it is time to shoot or when you try to flag the geese towards your setup.
Geese are smart, they can make out unusual movement and shapes in a setup, like a moving hunter or a poorly camouflaged blind. They know what to avoid. They are very smart.
What species of Geese are you planning on hunting? I hunt Ducks and Canada Geese in Southwest Idaho.
Good luck!
Jared