  Exact solutions describing the spherical collapse of null fluids can contain
regions which violate the energy conditions. Physically the violations occur
when the infalling matter continues to move inwards even when non-gravitational
repulsive forces become stronger than gravity. In 1991 Ori proposed a
resolution for these violations: spacetime surgery should be used to replace
the energy condition violating region with an outgoing solution. The matter
bounces. We revisit and implement this proposal for the more general Husain
null fluids including a careful study of potential discontinuities and
associated matter shells between the regions. Along the way we highlight an
error in the standard classification of energy condition violations for Type II
stress-energy tensors.
