Вот ответ официального 5 звездного российского судьи, Ирины Макнами, если точнее ссылка на разъяснение ФЕИ по поводу подобных моментов.
Irina Maknami Коллеги, извините, не успеваю сделать перевод... но вот, это новые указания судьям в связи с данной проблемой:
In the case of Patting the horse (riding with one hand):
Dear all,
Hereby a small guideline on how to act – if a rider rides with one hand and/or patting the horse in a way that can be misunderstood. Thank you to Stephen Clarke for helping out.
Apart from the halt and salute, where the athlete must take the reins in one hand, riding with the reins in both hands is obligatory at FEI Dressage Events. Whilst a discreet 'pat on the neck' for a well performed exercise or in order to calm down the horse is perfectly acceptable, (as is the situation of an athlete needing to wipe a fly from their eye, or other 'emergency situations' such as adjusting clothing, saddle pads etc) .
However, If the rider intentionallytake the reins into one hand in order to use the other hand or the reins either to produce more Impulsion from the horse, or to promote applause from the spectators, it will be considered a serious fault and will be considered in both the mark for the movement and the collective mark for 'Rider'.
Leaving the arena at a walk on a long rein, after having finished the test the athlete may, at his own discretion, ride with only one (1) hand.
For the Freestyle tests, see also Directives for Judges -Freestyle tests and Directives for assessing the degree of difficulty in a Freestyle test available at
www.fei.org.
The use of the voice or clicking the tongue repeatedly is a serious fault, which should be considered in both the mark for the movement and for the collective mark for the 'rider'.
Let the rider know directly after the test – explain (warning)and let your colleagues know it is important that we stand together as a group.