This is something that i kept theorizing about... i think since the Question arc?... about how there is a deep community that can control other hospitals to allow Irie to do what he wants to all the characters wherever they were... this is how he reached Rena when she was back in another city... i think i explained all the plot and how it happened... it was something close to an American KINO show... i thought my theory was way better than "le parasite"...