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You will find that different mechanics are expected or appropriate at various levels of play and locations. They vary from state to state or even association to association within a state at the NFHS level and for NCAA the conference supervisors dictate everything.
Things change again at the NBA level. Others who are better versed in the current NBA directives will be along shortly to fill you in and you may well find that what Mauer did is perfectly fine.
For example, perhaps your instruction so far applies to 2-man officiating. I can tell you that both HS and NCAA have the Lead official inside the thrower (official is closer to the basket) on most endline throw-ins in the front court in the 3-person system.
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