<prompt> Back spattering is -The negative pressure in the barrel, sucking blood and tissuesPassive agent in sodomyGushing of blood from the exit gunshot woundGushing of blood due to aerial bleed  <response>: The synopsis of forensic medicine toxicology ; dr k.s narayan reddy ;28th edition ;pg.no. 130 Back spattering is seen in case of contact shot where there is sucking in of blood ,hair,fragments of tissues cloth fibers several cm. Back inside the barrel . 