The play-by-play man announces a 5 minute tripping penalty for the Indians team. Tripping, even in 1937, is a 2 minute minor.
Some rough stuff results in each team taking 3 penalties. The result is 2 skaters and a goaltender left per team. The rules of hockey, even in 1937, stipulate that each team must have 3 skaters and a goalie on the ice at all times. The 3 penalized players for both teams do head to the penalty box, but each team should have put another player into the game to make it 3 skaters on each side.