Never put much thought to the inherent weakness of a quiver until seeing the part at :54. At any rate I can see how his method is good I'm sure that the mongols,Huns, and Comanche did not use quivers either or at least did hold a batch in the hands as he dose. Both the Mongols and the Comanche would actually lean beside the horse and fire over its shoulder. Which would mean in addition to being wicked horse riders they where wicked archers.
With the exception of the English long bow and some Japanese bow they always where a machine gun if sorts(rapid fire).
At the end of the day defense and what one chooses as weapon the important factor is ones skill. If your life will depend on it whatever that choice is the employment should so familiar as to be not second nature but instinct. If it is not well you may die. My dad used to always say your best weapon is your head(brain) everything else is a tool that you can weild. He survived two tours as a LRRP recondo in Vietnam so I'd say good advice.
The ending of the video