In the ancient theatre of London derbies, Arsenal and Chelsea met at the Emirates on a September afternoon that tested the difference between panic and purpose. Chelsea struck within 77 seconds — a wound delivered before the crowd had drawn its first collective breath — yet Arsenal, champions still wearing the weight of last season's long-awaited title, absorbed the shock and answered with the measured authority of a side that has learned to treat adversity as instruction. Goals from Havertz and Odegaard completed a 2-1 comeback that kept Arsenal level with Manchester City atop the Premier Lea