Since there is no time for heat to flow into the rubber band to supply the energy needed to overcome intermolecular forces, the rubber band gets the energy from itself;
(the rubber band; gets; the energy; from itself) (heat; to flow; into the rubber band; to supply the energy) (the energy; needed; to overcome intermolecular forces)
the rubber band heat the energy
gets to flow needed
the energy from itself
into the rubber band to supply the energy
to overcome intermolecular forces