When Douglas Whyte climbs aboard a non John Size-trained runner at the trials it pays to take note. That was the case yesterday when Whyte piloted stable transfer Castle Hero to a tidy turf trial win at Sha Tin. Castle Hero arrived at the Derek Cruz yard from Michael Chang Chun-wai after a solid debut fifth over 1,200m at Sha Tin behind All Victory on the first day of the season. The four-year-old came into his first-up run off two trials, but still raced green. He didn't settle in the early stages and made a complete mess of the turn, adding weight to his run-on sectionals of 23.01 and 23.69 when he finally got going. The unbalanced on-track display was matched by unmanageable pre-race antics - the solid type becoming fractious after loading and being forced to trial to the stipe's satisfaction yesterday, which he passed despite a slight sidestep after the jump. Whyte has partnered Castle Hero in his last two serious morning workouts, and made sure he was prominent in the trial. The gelding showed some race-winning attributes in the trial - quick reaction time at the start, high cruising speed and the ability to settle. But most importantly, he finished off the last furlong strongly. Without so much as a squeeze from the South African, Castle Hero burst away to win by five lengths from Sounds Excellent and New Asia Rising. It wouldn't surprise to see Cruz try the New Zealand-bred up the Sha Tin straight next time out after the eye-catching effort.