The record of either Smith or Root was always going to be permanently marked by the result in Adelaide.
In the end, Smith escaped without damage over his decision not to enforce the follow-on, while Root will be linked with the controversial call to win the toss and bowl.
Since potentially jeopardising a 215-run innings lead to invite England back into the game, Smith have appeared to carry the weight of the world on his shoulders. But that pressure and stress was released the moment Root was on his way back to the pavilion for 67, having not added to his overnight score when he feathered an under-edge low to Tim Paine behind the stumps.
Root thumped the toe of his bat in anger, as Hazlewood celebrated like a man who had just clinched the Ashes — emotion etched all over his face as he high-fived the captain and embraced Nathan Lyon.
"I was a little bit worried, but always had faith in the team and belief," Smith said after the match. "I thought if we came out and bowled really well and got one or two wickets things can happen quickly. It happened really quickly."
Smith said he hadn't thought too much about not enforcing the follow-on. "Fortunately we were able to hang in there."