Surely a caution is harsh there, what is the reason?
Had something similar at an RA meeting. Question was: Penalty given, player takes it before the referee has signalled? Everyone said 'retake and caution'. Which of course was met by, what is the caution for? A retake is suffice.
In Rafa we trust!
Good YC for me. Not mandatory. But appropriate given the clear instruction, goal and potential for drama.