Seth played the past 2 seasons for the Truro Bearcats of the Nova Scotia U15 Major Hockey League, serving as an assistant captain this past season (2021-22). In his rookie season (2020-21) he recorded 1 goal and 7 assists, and his team finished 2nd in the regular season with a 21-2-2 record and then advanced all the way to the NS Provincial championship final series to take on the Halifax Gulls, only to have it cancelled by the Covid-19 pandemic. In his second season with the Bearcats he recorded 7 goals and 12 assists in 25 games played, as his team finished the season with a 20-9-4 record. This season saw a return to the Provincial tournament format where the team went 2-2, missing out on a semifinal spot by tiebreaker.