It occurred to me that every boomerang I’ve seen (mostly tourist souvenirs) are way too light to act as a serious weapon of war or even for killing big game.
Looking it up on the web:
A maximum time of flight boomerang weighs about 25 grams.
A sport boomerang weighs less than 100 grams.
A native aboriginal boomerang for hunting or war weighs up to 1000 grams. That is a lot heavier.
I’ve never heard of a person being killed by a boomerang, but I have heard of a boomerang being used as a weapon against white police indoors, in a jailbreak incident.