I read a theory on twitter, where it said that possibly “Kaede could be deaf”
1.- HIS ENTRANCE
Kinjou’s steps are particularly heavier when compared with Asahi and Hiyori’s, like he isn’t paying attention or can’t to how loudly he’s walking. When Asahi calls after him, Kinjou makes no sign of hearing Asahi.
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2. THE LIGHT ON THE SIGNAL GUN
Asahi and Hiyori are looking DOWN at the water before the shot fires, Kinjou is looking UP at the gun, which has a distinct flare upon firing. This is a detail not used in other shots of signal guns.
THE LIGHT
Dive to the Future / Eternal Summer
3. NO SOUND
When Ryuuji is talking and the shot cuts to Kinjou: there is absolutely no sound as he gets off the starting block, no panting, not even footsteps. Then the shot goes to Asahi and Hiyori - you hear them panting, heaving. But Kinjou hasn’t background noise.
The body-sounds cut off entirely when the shot goes to Kinjou, all while Ryuuji is talking about “giving up something”? the last shot of Ryuuji is weirdly dropped to show his ear but not the entirety of his face.