Soulfright:
Fearless:At the end of the Shooting phase, a unit that has suffered one or more hits from a weapon with this special rule in that phase must make a Leadership test. The unit suffers a single additional Wound, with no armour or cover saves allowed, for each point this test is failed by. Wounds cannot be allocated to models with the Fearless or And They Shall Know No Fear special rules (any excess Wounds are lost).
You could argue that on model with the "fearless" USR does not make the unit have the fearless USR but only pass certain tests. It doesnt confer "fearless" to the other models.Units containing one or more models with the Fearless special rule automatically pass Pinning, Fear, Regroup tests and Morale checks, but cannot Go to Ground and cannot choose to fail a Morale check due to the Our Weapons Are Useless rule.
Tyranid synapse for example:
Same for imperial Priests.Friendly Codex: Tyranids models within this synapse range, including the Synapse Creatures themselves, have the Fearless special rule.
So according to the wording of Soulfright you can actually attack a squad of IG with priest support or Tyranids in a unit with some models in synapse range. You do cause wounds but cant allocate these wounds to the specific models with the "fearless" USR (in these cases the Priest himself and all tyranid models within synapse range)
Thoughts?