O_O *tree burst into thousands of Splinters**stops adding chakra and concentrates it to maintain the rasengan, then forces his palm along with the rasengan down on the tree*
Well Looks like you've got it down already.!
Now then Finally for the fire.
Create your Rasengan again and incorparte your Fire Chakra. Then You Can Causes a Huge Fire Malestrom Attack Destroying Your Opponent. U_U use it On Those Trees.