PATIENCE may be a virtue in life generally. It is a necessity in training horses. Former champion David Hill is up there with the best of them when it comes to that particular quality which is why the runs of his Casey's Drum and Lyphard's Lad were especially noteworthy yesterday. It is only in the last 10 days that Hill has upped the tempo on his first-season Irish import, Casey's Drum, who was making his Hong Kong debut having only had one start for a second place as a two-year-old in Ireland. Yesterday, he battled on well to run second to the rapidly improving Green Supreme and can be virtually relied upon to improve for the run both physically and mentally. He could win before the end of the season but he's one to follow more closely next season when he should have grown into his imposing frame. The griffin, Lyphard's Lad, has always worked well but it was not until yesterday's 1,400-metre trip that he began to take that promise into his races.