Jistkan Magistrate and Channel Element

[Rockblood]

I have a friend making a warpriest with the Jistkan Magistrate archetype and we came across the channel element class feature and im just stunned by how much it adds to channel energy to the point that i have no clue how it works. First it says that you get elemental channel as a bonus feat ok cool I understand how the feat works with instead of healing living and harming undead or vice versa you can choose to heal or harm elemental types. Its whats next on channel element that confuses me, it says He doesn’t gain the ability to harm undead with channeled energy (if he channels positive energy) or heal undead (if he channels negative energy). Instead, he can channel a blast of elemental matter and energy that buffets his targets. The Jistkan artificer’s blessing determines the damage type of this attack, as indicated by the table below. A successful Reflex save halves the damage. So the can't heal/harm undead is easy enough but what does it mean by channel a blast of elemental matter and energy that buffets his targets? Did it get changed to heal all living/harm everything with acid? Whats the point of the bonus feat if it got changed that much?

[Bertious]

Minor threcromancy here but as I understand it Elemental channel lets you use a channel charge to add elemental damage to your weapon for the next 3 hits. The second ability takes your channel to do things to undead and makes it an (Insert element here) ball that detonates around the channeler for channel dice of energy damage.

Probably best to make sure you can selective channel your friends out of the blast or be a shieldbearer or holy vindicator PRC to shape it in a more user friendly way.