Sonny Bill Williams has done it again.

A week after being lauded for lending a supportive hand to his devastated South African opposite after the semifinal, the All Blacks midfielder has given his Rugby World Cup winner's medal to a young boy at Twickenham.

Williams' latest unselfish act was again an act of compassion after a security guard tackled young fan Charlie Lines as he tried to go onto the field in search of a signature.

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"I was walking around doing a lap of honour with the boys and a young fella came running out and he got smoked by the security guard, like full on tackled him. I felt sorry for the little fella.

"He would have been eight or seven, I kind of felt sorry for him. It will be a night that he remembers hopefully."

1 of 5 PAUL GILHAM/GETTY IMAGES A day Charlie is not going to forget in a hurry. 2 of 5 PAUL GILHAM/GETTY IMAGES Sonny Bill Williams reaches over to young fan Charlie Lines. 3 of 5 PAUL GILHAM/GETTY IMAGES Sonny Bill Williams hands his medal young fan Charlie Lines 4 of 5 PAUL GILHAM/GETTY IMAGES The world's media caught the moment Charlie Lines was given the winning medal of Sonny Bill Williams. 5 of 5 HENRY BROWNE/REUTERS Charlie Lines is now Sonny Bill Williams' number one fan.

Williams later tweeted: "For a kid 2 have that will and take that risk, you deserve a medal. Enjoy bro."

The star midfielder's off-field acts have become a feature of his second World Cup and will again be a major talking point after the All Blacks' 34-17 win over the Wallabies.

All Blacks coach Steve Hansen spoke after the final about the team's desire to leave a good impression on people at the tournament.

WILLY NICHOLLS/Stuff.co.nz All Blacks centre Sonny Bill Williams reflects on winning the Rugby World Cup for the second time in his career.

"Win lose or not is irrelevant. What we want to do is leave this country with people understanding we have good values and aren't bad people to be around," he said.

"Enjoy the experience. Too many athletes' special occasions slip past and they don't get the chance to enjoy it.

"There are a lot of people who have realised we aren't the big bad ogres we are sometimes printed to be in the media in this part of the world. We are ordinary people who can play rugby reasonably well. Life is too short to be serious all the time. If you are serious all the time it's boring."

HENRY BROWNE/REUTERS Charlie Line can't believe his luck after being gifted Sonny Bill Williams' Rugby World Cup winner's medal.

Williams has been just one part of a charm offensive that's seen the All Blacks players go out of their way to be accommodating toward media and fans during the past seven weeks.

And after playing a key role in the final after coming on at halftime, he was again happy to crack jokes after emerging from the changing rooms under Twickenham.

"Nah I just closed my eyes and threw it," he said when asked if he'd seen Ma'a Nonu before the off load that set the dreadlocked one on a brilliant 45 metre run to the try line.

"Nah, just joking of course I did or wouldn't have passed it otherwise. He did his magic and we were lucky to get a try and get a few points ahead."

Four years ago Williams struck an uncomfortable figure after playing only a brief cameo role in the final win against France.

In 2015, he has seemed content to play whatever role his team needed throughout the tournament.

"I just wanted to go out and make an impact. I knew I was going to get a bit of time tonight and I'm just really pleased for the brothers, all the boys who are leaving, moving on. It's a pretty happy dressing room in there, but more importantly it's a happy country back home.

"All our friends and family who have supported us right through. Not just them, but the public support has been immense.":

Williams said the way the side had defended during the period when they were down to 14 men with fullback Ben Smith in the sinbin had made the final all the more satisfying.

"The boys dug deep and that's when you know your team is more than a team. It's like a brother hood. You bust your arse, you cover tackles, you push that little extra… because you are doing it for each other."

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