Hmm..Kermz plugin wouldn't look realistic enough for that situation. I'd suggest going to another place in the woods and filming a tall tree, but only get the trunk. The put blue behind it so you can superimpose it into the footage of you walking through the forest..so it'll look like there's another tree there, understand? Then you can just use the tree, and maybe photoshop it in half and make it fall down. Then , once combined with the footage of you in the real woods, should look pretty shibby.