"I've never played in front of 50 or 60,000 fans before. It felt hostile even though we're in Australia," said Tomane, who also insisted that he and his team-mates always believed they would pull through even though they trailed 15-9 with just five minutes remaining.
"The Lions fans really turned up. It made it feel like we were in England or Ireland or somewhere - it was crazy. But the Wallabies fans came and they got us through - we got the win because of them.
"The boys had faith in each other. Everyone had faith in everyone else. We knew that, if we could just hold on to the ball and build pressure down in the right part of the field, we could get the result. And that's what happened."
Tomane was quick to praise the efforts of captain James Horwill and the more experienced players in the Wallabies camp, with the former rugby league star grateful for the role they played in keeping him calm before and during what was just his second Test cap.
"The leadership group did an awesome job in keeping the composure during the week and that showed out on the field," added Tomane.
"The senior leaders helped everyone stay calm and helped us work hard during the week. They helped relieve some of that pressure, especially for some of the younger guys who hadn't experienced anything like this before.
"James Horwill's leadership on the field and just speaking and talking and getting us to stay calm was really inspirational for us. He just helped us stay patient - that was what he was spreading out."
But while Tomane and co may have been calm throughout much of the build up and the majority of the match itself, he admits that wasn't the case when Leigh Halfpenny lined up a last-minute shot at goal that would have won the series for the Lions.
Halfpenny's 55-metre effort fell just short to keep Australian hopes alive, less than four minutes after Tomane's Brumbies team-mate Christian Lealiifano had knocked over a nerveless conversion to push the Wallabies in front.
"Oh man, I was scared. I was about to cry! It was right in his range as well and I was like, 'Oh jeez'. I'm sick of games coming down to kicks - last week was the same and it's happened again this week. Hopefully in Sydney it doesn't come down to a kick.
"Christian's clutch. He's done it for us at the Brumbies and he's done it for our country. He came through for us. I had absolute faith that he would slot that. To be able to do what he did, especially after not remembering anything from last week's game (when he was knocked out after a minute), just shows how mentally tough he is as a player."