Osher had just put on another of his snazzy suits, and the final Masked Singer performers were in their large, hot and sweaty costumes, ready take to the stage as giant creatures for the final time.
But then, with just two hours till they were due to press record on the show's grand finale, production was immediately shut down after seven crew members tested positive for COVID-19.
Now, within two days of the first announcement, the cluster has grown to 16 positive coronavirus cases. According to TV Tonight, this is from 289 tests.
"Network 10 can confirm that 16 members of The Masked Singer production team have received a positive test result for COVID-19," a statement from the broadcaster read.
"All members of The Masked Singer production will undergo a 14-day period of self-quarantine as advised by the Department of Health and Human Services. All production crew will be adhering to this instruction."
Those in mandatory isolation include judges Jackie O, Dannii Minogue, Urzila Carlson and Dave Hughes, the celebrities, and host Osher Günsberg.
Osher Günsberg on The Masked Singer's production halt. Post continues below video.
Speaking to The Project on Sunday, Günsberg said the outbreak began with a dancer on the show.
"The pyrotechnics were loaded, everyone was in costume and we were ready to go," he explained from quarantine.
"This [dancer] was so brave... [they] put their hand up and said, 'Hang on, guys, I'm not feeling so great.' They were brave enough to pull the emergency brake on the freight train.
"We hit stop and everyone shut down because nothing is as important as everyone's safety. I hope we can set that as an example: if you're not feeling great, it's not worth it.'"
All episodes of the show have already been filmed, except for the finale, meaning the show will continue to air as normal on Monday and Tuesday nights for the next three weeks.
The entire production team of The Masked Singer Australia, including @oshergunsberg and the high profile panel are in self-isolation, after a confirmed Covid case on-set . We caught up with Osher to find out details of what we can expect next. pic.twitter.com/LS6Nt6oXoq— The Project (@theprojecttv) August 23, 2020