I think that was hinata on his imagination flashback that when he saw the little giant in first time he suddenly idolized him and work harder to be like him and be called into little giant too thats why all of his hardwork and pain causes him,his dream came true and his partner/bestfriend is beside him fighting to the world,even tho if kageyama and hinata can be separated from schools and they fought each other nothing breaks their friendship build by the karasuno's teammates or AKA their friends,because all of their memories dont separate and together they will "FLY" and reach their goal to see the summit on the other side(๑•ㅂ•)و✧ ε=ε=(ノ≧∇≦)ノ ┗( T﹏T )┛ (=・ω・=) ٩(๑❛ᴗ❛๑)۶
Now that you guys mentioned the soccer ball.. I realized this when I rewatched a few episodes of the anime adaption of Haikyuu a week ago.. I saw Hinata watching the Little Giant for the first time.. In a bike.. With a SOCCER BALL.. Sorry for the late reply, but I just realized it now.. And I felt dumb about it (╥﹏╥)
They've grown so much.. I'm a proud fan right now.. I feel teary tbh (╥﹏╥)
Btw did ya'll see that boy in a bicycle.. I think he's gonna follow our little gingers path and legacy (╥﹏╥)♡
I still can't move on that the manga has ended months ago.. (╥﹏╥)