A shell-shocked Mark Williams has struggled to account for his side's 68-point loss at the hands of a rampant Swans outfit at the SCG on Sunday.

"If you come and watch us train you'd see that we do a lot of tackling and we do a lot of scramble-after-the ball and try and win stoppages but it didn't come out at all in the play today," a perplexed Williams told reporters after the match.

The Power led early in the first term and remained firmly in the contest at the long break before a seven-goal onslaught from the Swans put the result beyond doubt.

Williams admitted he was powerless to stop the third-quarter tirade and was quick to heap praise on Paul Roos' men.

"All credit to the Swans, they were fantastic today," Williams said.

"I watched them last week and they kicked six goals for the game … to kick 22 and beat us by double our score we didn't see (coming)."

"Probably for three quarters we were competitive, (but in the) third quarter we were just terrible."

"It looked like boys versus men out there."

The heavy defeat sees last year's grand finalists remain winless after two-rounds but Williams has not lost the faith just yet.

"The couple of years we finished minor premiers in 2002 and 2003 we might have lost the first two games and finished on top (at season's end)," Williams recalled.

"So we certainly haven't lost the understanding that it's certainly a long year."

But Williams knows the Power must re-group quickly ahead of their round-three blockbuster against the in-form Crows on Sunday.

"Next week's a huge game for us … certainly if we need something to get us up that would be it but we can't expect to deliver that sort of stuff and expect to win," he said.

"Obviously the Crows belted West Coast yesterday so they'll be pretty confident."