This one in particular seems to be referencing Orfevre's debut race as a 2-year colt at Niigata, where he won the race and then proceeded to savagely buck Ikze off before trotting over and prodding him with his hooves as though to say "Oh come on mate, it couldn't have hurt that much."
Yinyanlolo said:
Oh god, she's a menace lol no wonder he design include that face mask, it's a muzzle lol
Speaking of, Orfevre's great-grandsire Halo was particularly infamous for needing to be muzzled all the time when handled because of his nasty temper. As in reach-around-you-to-pick-you-up-by-your-stomach-before-throwing-you-on-the-ground-and-then-kneeling-to-brutally-maul-you nasty. Which is why fan-Umamusumefied versions of him tend to consistently portray her with a literal muzzle.