S.Thomas’ College, Mount Lavinia produced a spirited second-half comeback to defeat Sri Sumangala College, Kandy by 31 points (three goals, two tries) to 24 (two goals, two tries) in their pre-quarter-final of the Dialog President’s Trophy Schools Under-19 Knockout Rugby Tournament played at Havelock Park yesterday. The Thomians trailed 12-17 at the ‘breather’ before turning the game around with a powerful second-half display.