Collingwood was the big story of the day. The club's continuing slide from 2021 footballing relevance deepened when the Magpies lost a thriller against Port Adelaide at the MCG on Sunday. A far bigger story, which goes to Melbourne's fourth lockdown and its emotional toll, lurked unseen in the stands. Among the 23,415 spectators was an unwelcome guest. Hitched to a fan who sat on the first level of the Great Southern Stand, somewhere between bays M1 and M16, Covid-19 had gone to the game. Eighty minutes later, across the city at Marvel Stadium, another fan with Covid-19 watched the Essendon-North Melbourne game. This fan unwittingly exposed people on the third level of the stadium, as well as the first.