User blog comment:Auric Drake/Light Novel Volume 15 discussion (warning: spoilers)/@comment-3456138-20180722055136/@comment-34962159-20180722080358

It's not a time loop, but rather a memory loop. Fugil uses Ouroboros to change people's memories to replicate most of the effects of a time loop. This is why Singlen and Magialca only appear as Lux's hallucinations - they're already dead.