Maybe a bit old footage here, given that he is wearing a full body suit, but still a good demonstration of this tricky turn. Rules are as you undoubtedly know, that you have to end your backstroke on your back before turning and starting the breaststroke, which is why he touches the wall ever so slightly.
Here is Eric Shanteau doing the same turn with more of a somersault, where again you have to take care that you are more on your breast than your back when starting the breaststroke. Courtesy of GoSwim :-)
