If Betts had stayed put, the Red Sox could have handed the ball to closer Koji Uehara with a lead in the top of the ninth.
"Overaggressive," said Red Sox manager John Farrell. "Ill-advised. We sacrificed him to get into scoring position because Pat Neshek is under 1.15 seconds in his unloading times. Overaggressive decision on his part to attempt the steal."
Why did Betts go for the steal, despite the fact that the red-hot Xander Bogaerts was at the plate, followed by Ortiz?
"I thought I saw something, but evidently I didn't," said Betts. "I had a sign, it was a tough at-bat for a righty, I was trying to force something and I shouldn't have. I was trying to put points together pretty much and didn't have the right points."
Naturally, Betts wishes he could have a do-over.
"In hindsight, you can always make the right decision," Betts said. "If I'm safe, it's a great play. Since I'm out, it's terrible, so you just have to live and learn from it. Obviously, I know I messed up."
Betts is 13-for-17 in stolen-base attempts this season.
Ian Browne is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.