The International Freeskiers & Snowboarders Association held its junior freeride championships in British Colombia, Canada, in April, and one Breckenridge teen claimed a top-10 finish in the under-19 freeski division. Mason Heflin, 19, faced some of the best competition North and South America had to offer at Kicking Horse Mountain Resort. Out of 60 athletes in the qualifying round, Heflin placed fifth, solidifying a spot in the final. There, he…