Daemon is faster than Kaguya considering the fact that he was blitzing NL Code (White Karma) left and right so he could probably latch onto her back and then just reflect everything on her until she dies.
@IKTime She could also trap him in ice temporarily like she did Naruto and Sasuke still get out and that wouldn’t trigger murderous intent, Kaguya has options here.
If Daemon can get on her back on time, she might kill herself. Even if she merges with the ice, her attacks will get reflected as she is trying to harm Daemon. If she tries any insta-kills, its GG for her, so it depends on if she is smart or not.