Mikel Arteta has shared two reasons why he was unhappy at half-time during Arsenal’s win over Chelsea last night. The Arsenal boss certainly wouldn’t have been disappointed at the final whistle after watching his side hit Chelsea for five. Kai Havertz and Ben White were both at the double in the second period after Leandro Trossard opened the scoring early in the first half. Despite an emphatic 5-0 win, Chelsea certainly had their moments in the first half, with Nicolas Jackson going close. It could have easily been level heading into the break, despite some bright play from Arsenal in the fin…