His first try came after a spectacular 50-metre run in the 66th minute, beating four players en route to the line. His second score came six minutes later.
DTH, who signed for Glasgow earlier this month, also kicked a conversion.
Canada's fourth-place finish was its best ever at the tournament since it moved to a six-team format. The Canadians now focus on a World Cup qualifying series against the U.S. - July 4 in Charleston, S.C., and July 11 in Edmonton.