  Galaxy clusters are the largest virialized objects in the universe. Their
merger dynamics and their interactions with the cosmic filaments that connect
them are important for our understanding of the formation of large-scale
structure. In addition, cosmic filaments are thought to possess the missing
baryons in the universe. Studying the interaction of galaxy clusters and
filaments therefore has the potential to unveil the the origin of the baryons
and the physical processes that occur during merger stages of galaxy clusters.
In this paper, we study the connection between A3395 and the intercluster
filament with NuSTAR, XMM-Newton, and Suzaku data. Since the NuSTAR observation
is moderately contaminated by scattered light, we present a novel technique
developed for disentangling this background from the emission from the
intracluster medium. We find that the interface of the cluster and the
intercluster filament connecting A3395 and A3391 does not show any signs of
heated plasma, as was previously thought. This interface has low temperature,
high density, and low entropy, thus we suggest that the gas is cooling, being
enhanced by the turbulent or tidal 'weather' driven during the early stage of
the merger. Furthermore, our temperature results from the NuSTAR data are in
agreement with those from XMM-Newton, and from joint NuSTAR and XMM-Newton
analysis for a region with ~25% scattered light contamination within 1 sigma.
We show that the temperature constraint of the intracluster medium is valid
even when the data are contaminated up to ~25% for ~5 keV cluster emission.
