College Mechanics More Lenient?

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CCA Mens Pg 74 says:

When an official calls a violation:

A. Simultaneously give a single sharp blast of the whistle, signal timeout, then drop whistle from the mouth. More than one blast should be used in unusual situations.

Pg 75 says:

Three distinct and seperate movements may be made for an out-of-bounds call: Stop clock, point direction, then indicate the throw-in spot.
There is a diagram showing this as well.

The word "may" is whats causing the confusion, they should've used "shall" instead...