I think you are probably right, but it was really, really close. The thing that makes me not 100% sure is the fact that the ball didn't seem to come out as a result of him hitting the ground. There was not a good look, but it seemed that he could have been losing the handle on the way down.He was down...c'mon
Was the ball stripped? I didn't see that it was. That makes me think it may have been a fumble, considering it would be very odd for a back to fumble because his ass hit the ground or whatever.