[quote=@Rilla]
personally, I would either not fight them, or treat them like magic. 

As Skally said, we have no issue avoiding lightning bolts, or any other form of magic, so why should bullets be any different. Sure, real world rules apply and all, but at some point we'd have to address why I can shoot magic bolts of electricity from my fingers. 

in other words, dodge it like you would anything else. You see a person aiming a fire staff at you, you run and dodge, and generally try and stay out of the fire thats surely coming. Do that with a gun. If they aren't prepped/adequately aimed, chances are they aren't gonna be accurate(unless its anime, or something, where you can lazily point and shoot), I believe the general term is 'firing from the hip', which isn't wholly accurate anyway.

another is 'spray and pray'

Sure, my idea may cause some issues as it seems like I'm slowing down the speed of the bullets, but I do that with magic anyway. Actually, of late, Frokane is the only one who hasn't tried to dodge something that, in the real world, would be virtually impossible to dodge(See: Kusanagi).

So yeah, dodge is like you do magic, or toss up that fancy shield, raise that solidly packed dirt. Howver you would dodge in a magic fire fight, do it with guns; unless the fight is strictly real world based.

want an example? Try and remember Gunfight For No Reason. No way those were supposed to last past the first one or two posts.
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The fire isn't typically moving at a speed that it is actually undodgeable.

We can also address how you can do that if you wish to apply real world behavior to it.