  Aims. We study a new broad well-defined arc of optical nebulosity close to
the cloud-shock interacting Criss-Cross Nebula, derive the basic physical
properties of the former and revise those of the latter, and compare both
objects to simulations of cloud-shock interactions from the literature.
Methods. Deep optical, partly wide-field, images were used to reveal the
intricate morphology and overall extent of the nebulosities. Optical
spectroscopy enabled us to uncover their nature. Results. The two nebulosities
obviously are physically linked, but are of different type; the Criss-Cross
Nebula is, as was shown also in an earlier paper, excited via a slow shock from
the expanding Orion-Eridanus Bubble, but the broad arc is definitely
photo-ionized. The source for ionizing photons appears to be hot gas in this
bubble. Some results of simulations of interactions of SNRs with interstellar
clouds available from the literature bear a striking resemblance to our
nebulae, which appear to represent an example - unrivalled in closeness and
clarity - for an early to medium stage in the destruction of an isolated cloud
over-run by a highly evolved SNR. Thereby the Criss-Cross Nebula is, when seen
from the SNR, the rear disrupted part of the original small cloud, whereas the
arc probably is its yet rather intact front part.
