If it's close enough to grab you, you will NOT have time to shoot, the only thing to do is pray and hope it only twists off your arm.
But if you could use a weapon at such a time (a waterproof weapon that fires underwater without exploding)it would have to be a handgun (or bowie knife)
because a rifle or long barrel shotgun (sawn offs with with Brenneke or Polycore solids OK) would be quite unwieldy and you would lose it in the attack most likely.
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