User blog comment:AquilaeAltair/OnS Theories (S5). Sixth Theory - The method used to extract a demon/@comment-36009152-20190917022243/@comment-38762161-20190918032930

Indeed it is, honestly it was awesome yet creepy seeing Noya appearing randomly from Mahiru's guts. Kagami really got inspired by classic horror movies haha. But yes, those daggers might hold the secret on how demons can be kept dormant or extract them from their vessels.

Likewise, those daggers are pretty helpful when it comes to memories. I personally think that Mahiru wasn't influenced by Noya instead, she had her will but she knew that some things are better when it comes to goals, deals and objectives yet we saw she deeply cares about Guren's heart compared to Noya; Noya's main goal is to devour Guren's heart while Mahiru has tried to keep it on a human base form or more likely evading the loss of humanity in Guren