pathfinder – Can a vitalist with a mixed party (undead and alive) transfer negative / positive energy from harming his allies to heal others?

As the title asks, can a vitalist use a negative energy of collective healing transfer against the living members of his collective to reorient him instead of healing non-dead limbs?

Whenever a volunteer member of the vitalist collective can recover lost health or capacity damage, the vitalist may choose to reorient all or part of this healing to one or more other volunteer members of the collective, as a Free action.

The part that makes me ask questions about it is the "could". If the negative energy directed to the living limbs could recover the number of undead, does that mean it could redirect him? Or vice versa, can the undead positive be used to heal his living allies?