The pro shop would make a killing if they sold chainsaws for 5000 credits, and you then get 3 goes with it until it expires!!
But its a joke, i was -2 at the 5th just now, i aimed between the 2 overhanging branches, used topspin and underhit drive slightly, and i tried my best to hit a tree, what happens, the ball goes through the first overhanging branches, then the tree i hit last time, it also went through that too, not just to the side, but right through it, and i birdie the hole. I think its programmed in to make you hit a tree if you're doing o.k just to toughen up the round a bit.
Therefore, in stead of being cautious and trying to protect the -4, its best to just aim for a tree