So, to recap:
Messi waits around to moan at the officials.
Arteta is celebrating in the tunnel in his home stadium.
Messi tells him not to celebrate in front of them and go to his changing room.
Arteta asks what he's waiting around for and tells him to go get changed.
Messi immediately revokes his demand for Arteta to return to the City changing room and decides instead to challenge him to some sort of 17th century duel, possibly slapping him with a leather glove to assert his articulate, gentlemanly dominance.
?
My god how I was hoping for tunnel cam footage.