Ref in PA,
Have you noticed that OS is agreeing with your position? What does that tell you.
Also, if your dog were lying on his stomach and you told him to roll over would you be pleased if he turned 90 degrees to the side? Would you have considered him to have completed the request?
Sorry, but it is clear that turning to the side does not meet the commonly accepted definition of "roll over." Your interpreter is instructing you incorrectly.