Does it even make sense that Sivir throws a boomerang?

The thing she throws is solid metal, right? And just from the size of it, it's like she's packing enough iron for two Darius axes.

Sivir carries that thing around with one hand, and the moment that mass comes flying back, she just stops it cold — her grip strength and core muscles are on another level.

At this point she could probably crush a human skull like Jell-O with her fingers alone, flex her abs and bust down any regular door, and leave an ab-print on a steel door.

Also, that boomerang has an auto-return feature.

Basically, she's tossing two Darius's around.

Honestly, she could just throw the boomerang and then crush anyone who gets close with her bare hands — 1v5 easy peasy.