Heya!

You'll be punished for less participation with the team.

You'll be prized for high participation with the team.

Now, what does that mean?
If you slack the leve and follow one member of the party for common cases ("Need to pee" "Have a Drink" "Watch grass grow" and so on) you'll participate less in the battle and you'll be rewarded less.

In the other hand, when you actively participate into the leve battle, your participation will be prized even more, so you'll be encouraged to not watch grass grow.

And I think that this thing equals with healers and their healing rate.

See ya!