I just select the group at the last frame before hes going to turn and hit incert and move the pivot of the group back in the center of you character for the turn. Just make sure you set a keyon the last frame with the new pivote point before you really start the turn.
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb