Its because he really didnt slam it.if you watch the replay he grabbed it acted like he was going to then his team mates were smacking him on the back and the ball dropped.. It never even went up in the air over a few feet after it fell out... Very bad call.. Ref was behind him couldnt really seeTo lose that way is unbelievable !!!! 9 Sec and winning and shooting free throws !!!
He didn't even look coordinated slamming the ball !!!