Due to that I think Clark could be shocked because of the side effects Chloe's new powers have and therefor I fear what they will be like and what they will do to other people.
This and Kelly Souders answer about Chloe's new powers got me thinking. And I know this has been proposed before, but what if Chloe's new powers are a variation on healing that instead of killing her, kills others? I mean, maybe not kill, but in a sense she's a conduit for transfering someone's lifeforce to someone else?
Instead of giving her lifeforce to heal and paying the price herself, she can now choose to take from others as well. So, that's a "new" power that won't kill her, brings ramifications for other people and brings a ton of ethical issues here: is one life better then the other? Can you choose between two people? Is it ok to hurt someone in the process of saving another? I think it would parallel Clark's choices and questions this year, but on a much more personal and direct level, I think.
My spec, going from what seems to be on the Space Channel trailer, is that it first manifests itself during
Odissey. Clark is shot, powerless in her arms and to save him, she tries to heal him, but instead of taking her life, she takes the lives of her kidnappers. Could be an accident and not exactly her fault...
And this scenario could set the stage for other things happening latter on, including maybe giving Clark a certain advantage at his fight with Doomsday latter in the season, making Chloe a part of it, but not the direct cause of Doomsday's demise.
Healing Oliver by borrowing part of someone else's lifeforce could really shock Clark. Even crazier, what if she's taking Clark's lifeforce for it? He has plenty. He's theoretically immortal. And wasn't that part of a LnC episode? And taking a bit of Clark's lifeforce could possibly not make him that much immortal anymore? Is that TPTB's answer to that problem?
Or maybe he's just feeling not so special anymore, that Chloe would risk her life for Oliver (!), when she previously did it for him. I mean, is Oliver as important to Chloe as Clark is? Yeah, that would shock him.