  Collective response of the plasma medium is well known and has been explored
extensively in several contexts. The single particle response is typically
treated as collisional interactions leading to dissipative effects. In this
manuscript a 2D molecular dynamics (MD) simulation of dusty plasma with Yukawa
interactions amidst dust grains have been considered in a strongly coupled
regime. It has been shown that disturbances induced in the crystal by
introducing highly charged particle elicit both collective and single particle
responses. The single particle collisional interaction often generates highly
energetic few particles which move with speeds exceeding the acoustic and also
the shock velocity (which gets excited by the external moving body inserted in
the medium). The dust crystal is observed to crack and deform along the path of
these energetic particles. Ultimately as they slow down they excite collective
response in the medium. It is thus observed that the medium ahead of the shock
gets disturbed by these energetic particles generated by collisional
interaction. The trailing shock then sees a disturbed medium. It is thus clear
that there is an interesting interplay between the single particle and
collective response in the medium which governs the dynamics.
