I agree with those who have said that it's a low percentage shot.
I look at it this way.....if the deer is that close to the base of your tree........why not wait till it steps out another 5-10 yards and then drill it dead center? If it's that close straight under you, then it's not going to smell you until it gets further out away from the tree, and as long as your not doing anything but waiting for it to ease out away from the tree....all you have to do is get ready to take the shot when it reaches your zone.
I've always been more comfortable with a 15-20 yard shot anyway, that's what I practice and that's my dead zone.
So, I'm going to wait till it moves out a bit, and if not then I'll get em' next time cause it aint' worth an all night tracking job....or worse.