Shoot the Canuck fan immediately; cannot be trusted nor reasoned with.
At that point, attempt to turn the Nazi against the Zombie with pop-culture video game references or basterdized Indiana Jones folklore - whether or not your attempt succeeds, shoot the Nazi as well.
If the Nazi did kill the zombie, attempt to kill the Nazi. If not, only shoot to maim so the zombie will divert his attention to the easiest BRAINS possible. At that point, bludgeoning/taunting/fleeing shall be re-evaluated on a case-by-case basis.
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