McIlroy, also 21, shot a closing round 62 to destroy the field at Quail Hollow back
in May, finished third in the last two Majors after shooting a 63 at St Andrews and then starred in the European Ryder Cup team.
Difficulty coming onto the bit, head tossing and hollow back
are all signs of pain in the poll area often caused by the overuse of artificial aids.
In all, Touch Of The Blues was Grade 1-placed on five occasions, including when twice runner-up in the Keeneland Turf Mile - to Landseer on one occasion, with Beat Hollow back
in third - and when finishing a close second to Six Perfections in the Breeders' Cup Mile on his final start.
Newsweek said: "The phrase proved hollow back
Flora wound the colourful chador around her head, pressed her hand into the base of her hollow back
and started to walk, pulling at Nazie, who looked around and then bunched up the hem of her skirt before joining her.