He might have been referring to something a lot of people do when they are too deep on their pullouts.
If you are too deep after your breaststroke kick after your pullout, sometimes you start your outsweep while you are too deep, and if you start your insweep before your head breaks the surface, you will get disqualified:
Form the rule book:
After the start and after each turn, the swimmer may take one arm stroke completely back to the legs. The head must break the surface of the water before the hands turn inward at the widest part of the second stroke.
Bookmarks