[Offside] The assistant referee raising the flag to disallow a goal from a loose ball

Look at the assistant referee's judgement in a crowded goalmouth. Omiya players protested that it was not offside, but watching the footage again, it can be seen that at the moment of the first shot, the player who finally turned the ball in was in an offside position. After the cross came in, several Oita players were also moving to block the shot, and players from both teams were mixed together in front of goal. In that situation the assistant referee had to pick up the moment the shot was taken while also judging the position of the player in an offside position, which made it a very difficult situation. Despite this, the assistant referee calmly gave the offside offence, which was an excellent decision.