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Borderline can't be used to exorcise an ayakashi out. Nothing will happen.
However, the god together with her shinki can exorcise it. The process is mentally similar to how a shinki can 'will' their borderline to cut only certain things, but applying it to how they attack using Rend. With both the god and shinki putting their careful attention to it, they can remove and kill the ayakashi out of the possessed being without injuring the being. For example, a shinki sword thrust into a human will extract and kill only the ayakashi so long as the pair is focusing on not harming the human. Be aware that one wrong move or lapse in attention could harm or slay the being.
In the thread, you and your god are welcome to try different things until they find what works. So long as they focus on it, no harm will come to the hound whether borderline or rend is used.
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Borderline can't be used to exorcise an ayakashi out. Nothing will happen.
However, the god together with her shinki can exorcise it. The process is mentally similar to how a shinki can 'will' their borderline to cut only certain things, but applying it to how they attack using Rend.
With both the god and shinki putting their careful attention to it, they can remove and kill the ayakashi out of the possessed being without injuring the being.
For example, a shinki sword thrust into a human will extract and kill only the ayakashi so long as the pair is focusing on not harming the human.
Be aware that one wrong move or lapse in attention could harm or slay the being.
In the thread, you and your god are welcome to try different things until they find what works. So long as they focus on it, no harm will come to the hound whether borderline or rend is used.
Hope that helps!