Arsenal (W) have demonstrated a high attacking output, averaging over two goals per match this season. Even in their 3-2 loss to Manchester City, the team maintained their scoring efficiency, demonstrating their attacking potential, especially in home matches.
Lyon (W) is one of the strongest teams in Europe, boasting a powerful and versatile attack. They have scored 16 goals in their recent French league matches, demonstrating the excellent form of their forwards and their ability to score even in high-stakes away matches.
Given the attacking nature of both teams, their motivation in the Champions League, and their head-to-head record (last season, both matches ended with over 2.5 goals), a high-scoring game with both teams scoring is likely.