Bobcat,
It's probably a "regional" thing. I was taught to do it that way when I started and always have. There is no mechanic that specifically says that an official has to blow the whistle to end the half or game. That said, it makes sense to me that one official blow the whistle to end the game (or half) because the horn does not always indicate the end of the game (if a shot is in the air or if there is a foul etc).
As long as you go over it in pregame with your partners and all officials are on the same page, you'll find a way that works. I've always found that the trail blowing it dead works beautifully but I know that in some areas they can't stand it when an official blows their whistle to end a half or game. Just do what's accepted in your area.
Z
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