Woods initially skipped away as the golfing world collectively held its breath, but showed no ill effects during the remainder of his round and was just an inch from a share of the lead when he left a 15-foot putt short on the final green.
"I was a little bit stiff when I came back out and started swinging again, but I was able to ratchet up the speed for 13 to just sort of go after it, " he said.
"It is really an incredible leaderboard", Scott said. And now he goes into the weekend one shot behind, the closest he has been to a lead going into the weekend at a major since the 2013 British Open at Muirfield.
But the 2013 Masters victor missed a short par putt on the par-3 16th - the bogey dropping him back into a tie for the lead at seven under alongside Day.
"I missed a few putts out there, but I'm not too bummed out about it because I hit them on my lines, " he said. "I was just very patient today, felt very good to be out there doing what I was doing".
Three-time major champion Koepka birdied the first hole but looked like he might unravel after running into trouble at the par-five second where he made a double-bogey after his drive found the trees to the left and second shot went in a hazard.
He knocked in the eagle putt to move to eight-under par. There are so many great players in with a chance.
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"Three [majors] in a row, I've been right in the mix", Woods added, building on his second place at last year's PGA Championships.
Tiger Woods missed all the action.
But in order to overtake the firepower at the top of the leaderboard, Woods will need to convert some of those putts - he missed five inside of 10 feet.
However, one security guard failed to take into account the slippery conditions, and slid into Woods, effecting a sliding tackle more commonly seen on the football field than the golf course. He was only seven shots behind, but he had 35 players in front of him.
"I know some people don't think I'm mentally tough, or tough in general, but I think I am", said Koepka. He understands how to play here.
He is not the only player to putt with the flagstick in the cup - allowed under the new Rules of Golf - just the only one to apply science to the decision.