And even if he fumbles, it doesnt mean the defense will pick it up, or that they'll make much of a return off of it. Jerome Bettis is a very reliable player and I would have done the same. I felt so bad for him after that play, and I know he must have been feeling it too.
After the Colts missed the field goal, it was funny seeing everyone console Bettis. I know Bettis must have been ecstatic!