Arsenal suffered their first defeat of the season with a 2-0 loss to Bournemouth, largely impacted by William Saliba's red card in the first half for a foul on Evanilson, following an errant pass from Leandro Trossard. Reduced to ten men, Arsenal struggled, allowing Ryan Christie to score from a well-executed corner routine, and Justin Kluivert to convert a penalty, sealing Bournemouth's victory. Despite the efforts, Arsenal's performance was hindered by the absence of key player Bukayo Saka and missed opportunities, like Gabriel Martinelli's chance. The defeat represents not only a setback in their title aspirations but also highlights the need for Arsenal to address naivety and errors that have cost them points this season. They will also be without Saliba for the upcoming crucial match against Liverpool, pushing Coach Mikel Arteta to find defensive replacements as they aim to bounce back.