A source close to the player has now lifted the lid on why Kai Havertz celebrated scoring his brace when Arsenal beat Chelsea. Kai Havertz did not hold back in his celebrations as he helped Arsenal put Chelsea to the sword recently. The Gunners thrashed their capital city rivals 5-0 at the Emirates Stadium just over a week ago. Havertz was in fine form that day, as he struck twice against his former club. How Arsenal striker Kai Havertz returned to haunt ChelseaThe German was picked to lead the line against the Blues, and was perhaps a bit tentative in his efforts to spearhead the attack in th…