An unfortunate turn of events for DJ (who really should have won the match), but his reaction was puzzling after he 1st grounded the club...looking as though he knew he'd messed up...but if so, why would he then ground it again? Apparently (from an interview afterwards) some players never bother to read the rules
...do they rely on their caddies to cover them in this regard? Did DJ's caddie miss giving his player timely advice & warnings; he looked oddly absent, buried amongst the crowd at the time of the infraction...just another odd angle on the mishap!