"Team Player" boon is a reaction?

[RyenLion]

Team Player
[reaction] (fortune) Uses 3 [ ] [ ] [ ]; Trigger An ally fails a check on which you Aided; Effect The ally can reroll the check and use the better result.

How can this work? You used your reaction to Aid them, so you do not have a reaction to do Team Player.

[logsig]

While it's not written properly (it shouldn't be a reaction or any kind of action, as it's really just a modification of what happens when you Aid), I think the intent is perfectly clear and a GM should rule sensibly.

You can read past discussion of this in the GM Discussion thread.