Sounds like he is making Bechamel Sauce!

It sounds like your friend is scalding the milk, which is a technique used in cooking - the whisking prevents the a protein skin from forming on the top, as well as from preventing the proteins and sugars from sticking to the bottom of the pan. Other than that - as GregWormwald points out, there is some stretching an introduction of air happening.
If it tastes good - keep doing it!

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