McIroy was very angry that Cantley’s caddie, when over-celebrating the long putt, apparently jumped up and down all over the line of McIroy’s putt when he was awaiting his chance to halve the match. McIlroy made his feelings known at the side of the green and it continued afterwards in the car park, with McIlroy having to be held back.
It sounds like the problem to McIlroy was a rude, unpleasant and jumped-up Yank caddie wanting his man to win at all costs and using his celebration to put McIlroy off his game. No decorum, decency or sportsmanship with some of these colonial types.