Duran vs Moore - was the thumb accidental/intentional?

That was one of Duran's most clever performance of his rugged arts,lacing gloves to Moore's eyes,busting Moore's kidneys,and even thumbing him.

The question though,was the thumb an accidental move from Duran's pawing jabs,or was it a clever move he did?

Some considered it a bad mark for the win itself (from what I viewed),but what do you guys think?

I personally think it looks legit enough to be a missed jab/bad paw attempt by Duran,yet I don't mind too much if it was a clever trick of his, Duran knew most of boxing's dark arts,he even doesn't seem to mind too much when Barkley,a man bigger than him low blowed him.