Quenching the brass in water has no effect on the annealing process, good or bad, except that it prevents the heat from spreading further. You wouldn't want to anneal the necks and leave the cases sitting there hot enough to cause parts of the body or head to also end up annealed. Getting the neck hot enough fast enough and then ending the process in water saves the rest of the case. Rapid cooling has no effect on cartridge brass.
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