Sneak attacks are good. If you have a bronze spear, you can throw it for sneak attack. It probably deals more sneak attack damage than shooting arrows. If you manage to sneak close enough, you can stagger the troll with your throw, then approach and auto-pickup your spear, and get free stagger multiplier damage in. You can then use the spear against the troll in close combat if you can stomach it, you'll need to manage your resources carefully for that.