Uh, I don't know what you're thinking, but its probably not as bad as you think
All it boils down to is that she tries to experiment on him and he snaps and shoves her head through a computer screen......16 times......and stabs her with a shard of glass for good measure.
(Un)fortunately, she's as enhanced as her mother is and laughs that it doesn't hurt her. Kazuma tells her that, upgrades or not, he'll find a way to kill her if she tries experimenting on him again.
See? Not that bad