Depending on how you mean rotate, you can use several methods, since if the player is not pointing perfectly towards the tree when copping, your tree would also fall in a funny direction.
I would use the “Find Look At” Rotation, which makes the tree face the direct line from tree to player, or face perfectly away (Depending on you you put in start and target pins.). You use the Z/Roll value of this rotation and set this as the Z/Roll value and plug it in a Set World Rotation. As the X/Pitch OR Y/Yaw rotation you insert the amount you want the tree to tilt with, as this now controls the rotation away fron the player.
If you want it to tilt a bit more per hit, you can now use an Add World Rotation node, and add the desired tilt degrees to the X or the Y value (depending on what you used before), and just leave the other add rotion values as Zero
Hope this makes sense