Elliot Daly impressed too, although he will be disappointed not to have scored early on and will also be frustrated he didn't put Williams over in the first half as the old failings of not taking their chances came back to haunt the Lions.
The great Lions scores of recent tours have all been sensational individual efforts - think Brian O'Driscoll and George North against Australia in 2001 and 2013.
It also included a lovely little block by Ben Te'o on Sonny Bill Williams - just the type of subtle trick that Warren Gatland had accused the All Blacks of last Monday.
But after that block it was simply glorious as Liam Williams sliced through the defence before Elliot Daly and Jonathan Davies took the ball on before laying it back for O'Brien to touch down.
New Zealand had fewer opportunities but took them thanks to two exceptional pieces of skill - Codie Taylor's pick-up and Kieran Read's incredible offload from the base of the scrum that set up Rieko Ioane's score.
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