Actions while under the effect of Hide From Undead

[Shar Tahl]

Here is the spell description:

Undead cannot see, hear, or smell creatures warded by this spell. Even extraordinary or supernatural sensory capabilities, such as blindsense, blindsight, scent, and tremorsense, cannot detect or locate warded creatures. Non-intelligent undead creatures (such as skeletons or zombies) are automatically affected and act as though the warded creatures are not there. An intelligent undead creature gets a single Will saving throw. If it fails, the subject can't see any of the warded creatures. If it has reason to believe unseen opponents are present, however, it can attempt to find or strike them. If a warded creature attempts to channel positive energy, turn or command undead, touches an undead creature, or attacks any creature (even with a spell), the spell ends for all recipients.

The bold segment.

Does the statement "Attempts to channel positive energy" refer to only harming undead or also healing living allies?

[Umbral Reaver]

I imagine that might be an oversight. Channel positive energy used to both heal living and hurt undead at the same time and was later changed to be a one or the other option.

[Shar Tahl]

It does seem that way, left over from when the channel did both at once. We are trying to set an official ruling for a PFS game starting up.

[Thazar]

As it does not specify a non-attack spell as breaking the effect I would say any channel that is not an attack would not break the spell. But if you channeled to harm an elemental it would break the spell vs undead just like a magic missile to an elemental would.