Removing PVC threaded section from cast iron

While repairing the subflooring, I slipped and fell on the PVC drain line that runs from the shower to the main sewer line (cast iron). The PVC/cast iron connection is threaded. The pvc broke right at the sewer line and there is noting to grab onto the unthread the PVC. What is the best way to get the PVC threaded section out of there?

Thank you

Keith

Carefully cut the pvc cross-section in a couple of locations with a hack-saw blade so it is part way through and
then split it inward with a chisel and hammer.

or

Just use the chisel and hammer to rotate the remaining pvc counter-clockwise to remove it.

Use care to not damage the threads in the iron.

Heat a screwdriver blade red hot, and "melt" a groove in the side of the plastic all the way down to the cast iron. You will have to reheat the blade a time or two. Once that is done the piece will "collapse" inward and you can twist it out.

Thank you, both.

Keith