It’s one of golf’s most well-known rules: If you hit your ball into hazard, you’re allowed go in and try to hit it, but you’re not allowed to ground your club. So if your ball is partially subdued in a narrow stream, as Zach Johnson’s was on 13 on Friday, your club isn’t allowed to touch the water.

Johnson didn’t think he did, but after ESPN aired a slow motion video of his shot from the water on that hole, both he and the rules official agreed he had accidentally touched the water. He was assessed a two-stroke penalty and, as a result, missed the cut.

https://vine.co/v/iILzQHE5ZhT

Unfortunate circumstances. Viewing slow video replay, the rules staff, my caddy Damon, and I ALL agreed it was HIGHLY likely I had touched — Zach Johnson (@ZachJohnsonPGA) April 9, 2016

water on the takeaway of my backswing. Impossible 4 me see in action below my club face, but easier to see on HD video replay. Hard to take. — Zach Johnson (@ZachJohnsonPGA) April 9, 2016

BUT, I (nor anyone for that matter) could not rest easy knowing I might have had a rules infraction. I'm thankful for the rules staff in — Zach Johnson (@ZachJohnsonPGA) April 9, 2016

helping me sign for the proper score, even though it stings. Of course, the MANY bogies before the 13th could have lessened the sting. Ample — Zach Johnson (@ZachJohnsonPGA) April 9, 2016