ok I found full 2pages of that hiori death.... so her earth body disappeared like fallen into peaces similar how Ikaros does weapons from synapse... and nymph is the one that yells to tomoki with tears in her eyes that this is not real hiori...
F...k cant wait for full chapter.... as I dont know why and how did earth hiori died...
Spoiler for 2 pic (4pages):
tomoki: wha... Hiori is....kazane is.... disappearing... hey... what is this... (first is a kanji ;/ so dont know... but in romanji its シヨウされるわ = shiyou sareruwa [ like she's done... {maybe the dreams hava a limit after getting to it they die/end dream... or maybe its a barrier that activats when a synapse resident gets to close/fell in love with a human/downer/bug... kinda its not allowed so the dream dies severing the connection})
I guess nymph is saying: "a pipe dream... its not Hiori"