"Green Day" and "Oasis" (11) (『グリーン・ディ』と『オアシス』 その⑪ "Gurīn Dei" to "Oashisu" Sono 11), originally The Man at the Colosseum (コロッセオの男 Korosseo no Otoko) in the WSJ release, is the five hundred sixty-fourth chapter of the JoJo's Bizarre Adventure manga. It is also the one hundred twenty-fifth chapter of Vento Aureo.
A close quarter fight ensues between Bucciarati and Secco. As Oasis is more powerful than Sticky Fingers, Bucciarati is thrown into a shop window, breaking the glass. While he recovers, Secco remarks that something shines at the 3rd floor of the Coliseum; this is the reflection of a wheelchair-bound man's binocular.
Now certain that there's something to obtain here, Secco goes on to finish off Bucciarati. However, Bucciarati disappears into the ground. Secco hears him move toward the Coliseum, and figures that his opponent will need to breathe eventually thus revealing himself. That doesn't happen, to Secco's confusion.