you are both right SM is most right I literally drop my entire shopulder which inturn drops and slacks my rein and throws her off balance. This is both my issue and her issue. She makes you carry her out of sheer stubborness and I give in and drop ...oh yeah and I look down bad bad bad habit !

I am slowly breaking the shoulder thing and much more unique is I almost only ever do it on my left shoulder my right is rarely dropped and my right rein never drops