[MNBlue]

You don't know what is going to happen next. If you move it a few feet out of the way, how do you know that a bad throw won't bring F2 a few feet out of the way right where you put the bat.

The offense discarded the bat. It is part of the field. If the defense wants it moved, they can move it. If the offense wants it moved, they can move it. If the umpire moves it, Murphy's Law says it will cause an unintended problem and the umpire will either get chewed out or some other problem will result. The umpire has better things to do than doing something the offense or defense should be responsible for doing.