The Power led by 47 points in the third term and were left shell-shocked as the resurgent Lions booted nine goals to one in the final term.
“That’s probably the worst loss I’ve been associated with at the club,” he said after the game.
“I can’t remember someone outscoring us by 53 points in the last quarter of the game, especially given the fact that we played terrific football for three quarters.
“I feel completely devastated for our supporters, who come here with a lot of hope in their hearts. To finish up like that was just a disaster for everyone and no one walks away from it.
“I’ve been involved in a lot of footy and you just don’t see that ever happen. You look for all the reasons in the world, but we don’t blame anything except ourselves.”
It was Lions king pins Daniel Bradshaw and Jonathan Brown who did all the damage booting five goals combined in the final term. But it was Port Adelaide’s stoppage work, which had been far superior for three quarters, that led to the Lions unlikely victory.
“From Brisbane’s point of view they did a great job to keep at it with the tide so far against them,” Williams said.
“Their guns in the last quarter, if you look at the stats of who was kicking goals and who was getting the ball in that quarter, they stood up and ran all over us.
“All credit to them. I think the stoppages might have been 15-to-two in the last quarter. We had our best players around the ball. We had our ruckmen there and it [the last quarter] was certainly against the feel of the night.
“For a team to be able to get up off the canvas like they did was outstanding, but the odds will say it doesn’t happen too often and it certainly leaves a bad taste in your mouth.
“For three quarters we was great, but we don’t take anything out of that – you can’t lose like that.”
The loss ensured the club’s worst-ever start to the season and the Power will be looking to turn it around against West Coast next week.
“The more you lose, the more pressure is on you – I understand that,” Williams said.
“It would be a mighty effort [to turn it around]. We’re certainly up against it now. Our character and our resolve will certainly be tested, but I think we lost four games in a row last year as well.”