Lemma handleMessage_sends_log : forall client id i net p d' ms m es e, In p (nwPackets net) -> handleMessage (pSrc p) (pDst p) (pBody p) (nwState net (pDst p)) = (d', ms) -> correct_entry client id i e -> In m ms -> mEntries (snd m) = Some es -> In e es -> In e (log (nwState net (pDst p))).