Board Thread:General Discussion/@comment-25672219-20170405004515/@comment-31252171-20180322121315

the answer to this is pretty simple.

not a single human SOUL was TAKEN. that does not mean that not a single human died. every time we die in the game Frisk's SOUL shatteres, so we know it's possible for a SOUL to shatter at death.

at the war, when there are magic bullets flying every where, i think it's safe to assume that the SOULs of humans that died in the war shattered immediately after their death.