Sae steals the loose ball that bounced off the post. Dribbles past Isagi, Barou and Nagi to encounter Rin who likely ran back at full speed after his shot missed. How are they near the U-20's D area?
After all that dribbling they should at least be at center or midfield. Isagi won't be offside since U-20 was in possession but... was he behind the defenders or did he ran past them for a direct shoot? If he was alone in the small D area, why didn't anybody notice him? - The position does not make sense!
I know most of you love this but I think this was a lukewarm ending for one of the best football matches in manga/anime.