We've been round and round on this issue before. Generally, there's two main schools of thought. One says that they are "official representatives of the school" (and so are mascots) and therefore shouldn't disconcert the shooter the same as a player on the floor or bench personnel.
The other says there is no specific rule to cover this and it is inconsistent to claim you can do this under the rule that says that if something isn't covered, you can just decide for yourself.
Personally, I just make sure they are not standing anywhere where they are likely to get in the way and let them yell all they want. After all, the gyms are usually noisy anyway and - this isn't golf.
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Yom HaShoah
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