Mika Biereth has been one of Arsenal’s best-performing players out on loan this season, and the attacker was again in fine form for Sturm Graz this afternoon. The Danish youth international started the season out on loan with Motherwell, yet it became quickly apparent that Biereth was too good for the Scottish Premier League with the striker scoring six goals and assisting five. Recalled in January and shipped out to the Austrian Bundesliga with Sturm Graz, Biereth has again thrived out on loan, with the 21-year-old forward looking unstoppable away from north London. Mika Biereth hits Sturm Gr…