While there is one video of a guy shooting his bow in that style,it is not known,if this was commonplace.No reason for you, not to learn it though,if thats what you want to do..The Bows in southeastern Oregon,were predominately Paiute, and Modoc..There seems to be various styles employed by the Paiute and ive seen evidence,of the Modoc,using a style,different than the style that is commonly attributed to them in recent years..My belief,is that many bows,that were documented as being from a particular nation,may have been taken in war,, acquired in games or trade items..