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McKenzie, who also sits on World Rugby's women's high-performance rugby committee, coaches a double tackle where one player chops the opponents' legs and the other targets the ball to prevent offloads.

Henderson reached through a double tackle to plant the ball but the Television Match Official said he knocked on.

That launched a Scotland attack of 17 phases before center Harris powered over in a double tackle to double their lead.

He was holding his left arm as he was carted off after a double tackle from Sexton and new cap Bundee Aki.

From a tap penalty with seconds left, Pablo Fontes de Castro drew in the defense, threw a missout pass to Inaki Villanueva on the left wing, and he passed out of a double tackle to give Ignacio Martin a free run in.