Paul Ross admits he and his AFL staff simply have to coach Melbourne better after losing to Greater Western Sydney in a second-half fadeout on Saturday in Canberra.
The Demons conceded a whopping 83 points at the main break, but themselves managed just 1.5 (11).
They were leading by 27 points after the second quarter.
Roos said his side's effort levels were so poor it was inevitable they'd get smashed.
"It comes back to the most basic thing in footy - if you don't try hard enough, you can do all the things in the world but you can't stop momentum when the other team's trying at 100 per cent," he said.
"The third quarter was shocking - we just capitulated.
"We did it well last week (against Gold Coast); this week it was just poor.
"It's something, as a coaching group, we've got to take responsibility for that because it's just unacceptable."
The former Sydney mentor said he tried a few strategic changes at the break to help stave off the Giants' charge.
"But ultimately, it comes down to us coaching," he said.
"The messages are obviously not getting through.
"We've just got to coach better than what we are at the moment."
Roos said, unlike their last-round victory, there weren't many good players over the four quarters.
He ranked Tom McDonald, Jack Viney and Jesse Hogan among only a handful of standouts.
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