a successful bunt added 0.1% to the win expectancy. there were other negative possibilities - pop out, bad bunt that results in the runner being thrown out at third, strike out (and of course there's the smaller chance of a more positive outcome, like fielder's choice with runner safe at third, or a throwing error on the bunt allowing the baserunner to score. i think the move is probably a net negative when you take into account the other possibilities, but i don't think it's an egregiously bad call to bunt there.