The handgun depicted doing the dirty deed is a .38 Revolver. Revolvers do not eject shell casings.
Major ignorance in development of solving the crime as no shell casing would have been ejected.
BTW, snipers are sent out in teams. One reason is to ensure the mission is accomplished. However, once a kill list has been confirmed, lone snipers can be sent out. Liv should had know that and had a backup. However Carlos Heathcock was sent on his own to take out Vietnam target, he expected a one way trip: https://en.wikipedia.org/wiki/Carlos_Hathcock
And the sniper motto: "One shot, one kill" Too much PC in this episode.
Major ignorance in development of solving the crime as no shell casing would have been ejected.
BTW, snipers are sent out in teams. One reason is to ensure the mission is accomplished. However, once a kill list has been confirmed, lone snipers can be sent out. Liv should had know that and had a backup. However Carlos Heathcock was sent on his own to take out Vietnam target, he expected a one way trip: https://en.wikipedia.org/wiki/Carlos_Hathcock
And the sniper motto: "One shot, one kill" Too much PC in this episode.