Well, you can make it simpler.
You see a group of ANBU (green or grey depends on your alignment) rushing through the forest.
=> Follow them from behind.
=> Pretend not to have seen them (You pretended that you didn't notice them as you heads towards the opposite direction of where they were heading).
=> Follow them from behind
One of them appears to be carrying a huge scroll on his back. While you were observing the group, one of them notices you and in a blink of an eye, you were surrounded by the ANBU.
=> Fight (You will have to fight the ANBU).
=> Run away (You create a diversion and escape the confrontation. You lost 1 forest fight fleeing from the ANBU).
Fight (win)
You take the scroll from the dead ANBU member who was carrying it and studies its content. It appears to be a technique scroll on <a random specialty>. You gain one level on <that specialty>.
Fight (lost)
You lost all gold in hand and <a certain amount of items> items were destroyed during the fight. but you are glad to have survive that confrontation.