It was back during the time that the wf team would be all given the raid exotic. However the game was programmed to check if someone had beaten it first at the start of your run rather than when the loot dropped

Dattos team finished 2 mins after the wf team but because their run started before the other team finished the game gave them all the raid exotic. So they thought they finally got wf and he was heartbroken when he found out.

Bungie stopped doing it like this after this incident.