So I was exploring a new continent and found a 1 star troll in a black forest...start shooting it with the hunter bow and flinthead arrows.
1st shot was stealth so probrably took 33% of his health and I kept shooting....

He walked in my direction and then turned back when he was with little less than half HP and just walked into the water deeper trying to get away from me.

I knew Sea Serpents and Necks try to escape from you...but now trolls flee aswell when they are in trouble...I wonder if all mobs will try to get away from you when they start to "fear" you or something.

BTW beware of Pufffish (the little spiked ball fish) jumping inside your boat and poisoning you...specially when you are sailing with empty stomach the posion might kill you.