I don't know if thi sis possible but:
when Player S, shoots Player M with a panzer and they both die from the rocket, Player S gets the kill and a suicide.
My idea is
when Player S shoots Player M with a panzer and they both die from the rocket, Player S gets the kill, and Player M also gets the kill on Player S.
But if player S shoots his panzer and it hits a wall or the ground first, and they both die - player S should get the kill and a suicide.
Oh and if Player S dies from the shot to player M, but Player M does not die, player M should still get the kill.
And if somehow it hits 2 people, maybe Player M and Player N (i'm not sure if that's possible) but, whoever it hit first should get the kill