Well, carp.

At this point, I'd say there's two things we could do:

1. Have Shuriken use ninja speed and attempt to deal as much damage as possible to Spoy. Here's what would most likely happen in this case:

Spoy's HP: 13/22
Shuriken + ninjaspeed: 10
Enchantresphere: 4
Spoy's HP: -1/22
Spoy's POWER: 12
Spoy's healing gun: 15
Spoy's HP: 26/22

Note that Spoy's health drops below 0 for a small period of time. This may be enough to kill him, judging by how his healing effects tend to happen at the end of the round.

2. Have Shuriken use ninja speed and attempt to deal as much damage as possible to Unfooruman, while moving far away from Spoy. I'm guessing what happens in this situation:

Shuri attacks Unfoo
Unfoo's HP: 28/38
Enchantresphere attacks Spoy
Spoy's HP: 9/22
Spoy attacks Enchantresphere
Enchantresphere's HP: either 5/9 or 1/9
Unfoo uses toxic waste thing that we don't know what it is yet
Unfoo attacks Shuri
Shuri's HP: 0/16

These are just speculations, however. I'm not going to make a move, I'll let someone else decide what to do, since generally my tactics have turned out to be sux. Personally, I suggest the first tactic.

Edit: However, since one of the strategies will get us killed, I'm going to advocate the other.

Shuriken: NW, W, defend
Sphere: attack Spoy