"Battle brothers are treated as 'friendly units' from all points of view. This means, for example, that Battle brothers:
-Can be joined by independent characters
- are counted as friendly units for the targeting of psychic powers, abilities and so on
-however note that even battle brothers cannot embark upon an enemy vehicle"
"Units in your army treat Allies of convenience as enemy units that cannot be charged, shot, targeted with psychic powers or have templates or blast weapons placed on them....
This means that, for example, allies of convenience: ...
- are not counted as friendly units for the targeting of psychic powers"
"Desperate allies are treated exactly like allies of convenience"
"Blessings target friendly units and, unless otherwise stated, last until the end of the following turn".