Arsenal were a bit all over the place against Porto. The occasion appeared to get to the Gunners on Wednesday night as they played their first Champions League knockout game in half a decade. Many of Arsenal’s players were playing in their very first Champions League knockout game, and, to be honest, you could tell that many of these players hadn’t played on this stage before. Indeed, a number of the Gunners’ key players appeared to freeze, but one player who was able to come into the game and adapt to the occasion with ease was Jorginho. Jorginho played the last 20 minutes for Arsenal against…