[Shujin]

If you have a bonded youkai out and shared joy, and you use healing dischagre in range where both should be healed, it only counts one healing and splits it up.

Aka what I expect to happen is that you get two times half the healing, so it sums up to the normal healing again.
What actually happens is that your healing is halved and you would heal more without shared joy.

All three in radius of the Healing discharge, Haku is not bond.
Shared Joy! Tyrant and bonded allies recovered 60 HP.
Haku recovered 121 HP.
Shared Joy! Snow Crow and bonded allies recovered 60 HP.

I think thats not the idea behind it.