If a delivers unexpectedly at home and breathes spontaneously - leave the cord alone. If your baby is flat and non breathing, do not assume that the cord will continue to provide adequate oxygenation after delivery.
I didn't think anyone here suggested they would assume that? While the cord remains intact, the baby can still receive *some* oxygen while attempts are made to assist a flat baby to commence breathing. I know a midwife who trains paramedics in emergency childbirth and she instructs them to leave the cord intact for that very reason.