Looking over the teamwork powers, I get the impression that the best model for them is a bunch of upgrades for Pack Instincts.
So that's how I'm representing them.
I'm also rewriting Pack Instincts slightly.
PACK INSTINCTS [-1]
Description: You are part of a pack, a group of beings that are connected on a supernatural level.
Musts: You must define who is in your pack, and they all must share this ability with the same upgrades.
Skills Affected: Alertness, Investigation, others.
Effects:
Pack Communication. When you are near another member of your pack, the two of you may communicate in a manner that no-one outside the pack can understand. The exact mechanism that this ability works by varies from pack to pack. One pack might be telepathic, while another might speak in squeaks, while another might simply read body language very well.
Combined Awareness. When you are near another member of your pack, add one to your Alertness skill. If any nearby member of your pack notices an ambush or something hidden, you also notice that ambush or that hidden thing.
Locate Packmate. You have an instinctive awareness of your packmates' locations, and you may use your Investigation skill to determine what those locations are.
Cooperative Instincts [-1]. When making a maneuver to assist one of your packmates, add two to your roll. Furthermore, when tagging an aspect created by one of your packmates, add one to your roll.
Protective Instincts [-1]. When you are attacked while in the same zone as one of your packmates, you may use that packmate's defence skill instead of your own.
Pack Communion [-1]. You may use your Pack Communication ability without regard for distance.
Anybody have anything to say?