The Dockers booked their preliminary final spot against Sydney after defeating Geelong by 14 points in a semi-final classic.
A big focus heading into the do-or-die clash against the Cats was the collective form of Amiss, Josh Treacy and Pat Voss after they had combined for just two goals in the 32-point qualifying final loss to Hawthorn.
The trio answered in resounding fashion in front of a sellout crowd at Optus Stadium on Friday night.
Voss kicked four goals and did an excellent negating role on star Geelong defender Tom Stewart, who was restricted to just 15 possessions and one intercept mark.
Stewart averages almost eight intercept possessions per match, but he was restricted to four on Friday night.
Treacy was like a battering ram on the way to eight marks - including three contested grabs - and one goal.
Even being crunched by giant teammate Mason Cox couldn't stop Treacy from having an important influence on the match.
And Amiss popped up in important moments to finish with two goals and a goal assist.
Amiss said he, Voss and Treacy made sure to stick tight in the wake of the loss to Hawthorn.
"Obviously there was a little bit of outside noise," Amiss said.
"But how we review it, everything's internal. We speak to the right people about it.
"We always support each other, no matter what. And that's been the mentality all year.
"We know that playing with three big boys up forward, one person's going to have their night and the others might be a bit quieter.
"But we're happy with that as long as everyone's committed to their role and helping each other."
Fremantle played with far more freedom against Geelong, with players encouraged to take on the tackler and be proactive with the ball.
It's a mindset the Dockers have adopted for most of the season, but it went missing in the qualifying final due to the pressure of the moment.
Freo regained their mojo against the Cats, and they're determined to continue playing with the same positive mindset against the Swans at the SCG on Friday night.
"It was more just coming back to what's made us good and what's won us games this year," Amiss said.
"We've gone back to where our footy is at its best, and that's around the contest, our pressure and our trademark footy."
Dockers defender Brennan Cox is shaping up as the hard-luck story of the finals.
Cox strained his calf in the final-round loss to Carlton and had been slated to return in time for the preliminary final.
But given there were doubts over Cox's body even before the calf setback - on top of the sound form of Oscar McDonald - Cox is unlikely to be picked to face Sydney.
