I think I finally found an answer as to why there are still conduits after you use the RFI.
See, it affects only people who were exposed to the ray sphere. As we can see with Alden Tate for example, conduits can be made without a ray sphere, so it killed the conduits we saw, since they were exposed to the ray sphere(Well, Sasha and Alden aren't certeinly dead. Remember?), but Delsin for example, wasn't affected.
What do you think?