ballot counters home. The observers and media then left.
"Later in the night, Regina Waller, the Fulton County public affairs manager for elections, told ABC News that the election department sent the State Farm Arena absentee ballot counters home at 10:30 p.m. despite earlier intentions to complete processing Tuesday night."
https://abcnews.go.com/Politics/pipe-bursts-atlanta-arena-causing-hour-delay-processing/story?id=73981348
It was announced on multiple national channels that the vote counting was being halted for the night. But some stayed behind and started counting again.