Whee a spirit. That's what weapon foci are made for. There are so many targets. The spirit or the troll? I'll take the spirit since I don't think an Ares Predator is gonna impress it much. 
Posting rolls so they are there when my Initiative comes up:
Quickdrawing Meitou Shuusui, my weapon focus katana (possible due to Iajutsu maneuver):
Reaction 9 + Blades 9 + Specialization 2 = 20 Dice: 20d6.hits(5) = (9) Guess I made the treshold of three.
Attacking the Water Spirit with a Called Shot for +4 DV: Agility 10 + Blades 9 + 2 Specialization +4 Weapon Focus +1 Customized Grip +1 Reach -4 Called Shot = 23 Dice
23d6.hits(5) = (6) (Ugh seriously, 6 hits on 23 dice...)
I want the thing dead, I use Edge to reroll misses (2/3 remaining)
17d6.hits(5) = (5).
That makes 11 hits and a base damage of 13 P.
Edit: Oh I just saw the thing is still 50 meters away. Guess I won't reach it in this Initiative Phase. So my attack is against the Troll Pirate then. The spirit can get what's his the next phase.

Posting rolls so they are there when my Initiative comes up:
Quickdrawing Meitou Shuusui, my weapon focus katana (possible due to Iajutsu maneuver):
Reaction 9 + Blades 9 + Specialization 2 = 20 Dice: 20d6.hits(5) = (9) Guess I made the treshold of three.
Attacking the Water Spirit with a Called Shot for +4 DV: Agility 10 + Blades 9 + 2 Specialization +4 Weapon Focus +1 Customized Grip +1 Reach -4 Called Shot = 23 Dice
23d6.hits(5) = (6) (Ugh seriously, 6 hits on 23 dice...)
I want the thing dead, I use Edge to reroll misses (2/3 remaining)
17d6.hits(5) = (5).
That makes 11 hits and a base damage of 13 P.
Edit: Oh I just saw the thing is still 50 meters away. Guess I won't reach it in this Initiative Phase. So my attack is against the Troll Pirate then. The spirit can get what's his the next phase.

I edited the Spirits actions to use the Movement Power (Complex Action) and a charge, so it will end the Combat Turn 10 meters away from where you stand. You can attack it if you like, as the other targets are 60 meters away.