First off, Perception: [roll0]
If Talas runs towards the trees, Trefoil will attempt to circle around, keeping to the trees, and attack him. If he's slightly out of reach, she'll use Tanglevine (15 ft reach) to try to trip him.
Attack / Damage for option 1: [roll1] / [roll2]
Trip for option 2: [roll3]
If Talas runs towards the shore or pretty much in the opposite direction, Trefoil will attempt to move next to Willow and attack her (I think this is within 30ft, but I'm not quite sure). In which case:
Attack / Damage: [roll4] / [roll5]
EDIT: Ah, I keep thinking the distance are shorter than they really are. Scratch the previous actions, unless Talas actually just runs to where Trefoil's standing.
1. If Talas starts moving towards the trees, Trefoil will spend her turn moving, running if necessary/ possible, to roughly across from him (where she thinks he will enter the forest), still staying within the trees.
2. If Talas moves to the trees roughly in the southeast, Trefoil will instead move to the grassy area in the southeast in an attempt to intercept him next round.
3. If he gets attacked/ does something else, she'll attack Willow.