Indeed. And designed not to harm cut or scratch the person wielding it even when used with a huge amount of power behind it.
From the way the wounds have been descried credible sources, such as the coroner, nothing excludes direct deep thrusts, which are also the most common sense and logical for the killer to have used -- as that is virtually instantly debilitating, virtually silent -- and silencing.
My first post here on this killing weeks ago was one after I saw a forensic "expert" on YouTube commenting on this case and saying knife murders hands would be cut.
I don't know about that expert, but in basic we spent hours thrusting a combat knife into dummies. ballistic material and wood 2x8's and no one cut or scratched their hands.
And this was not a knife fight. It was not west side story slashing. It wasn't a switch blade or domestic killing at had escalated to slashing with a kitchen knife. It was an ambush stabbing of sleeping or barely roused people. if you are standing above someone, especially a petite female where they are sleeping, any fit military age male could put a butter knife all the way thorough their chest. we know form multiped credible sources that the knife left a bruise. That with virtual certainly means a direct deep powerful stab fully in one side and out the other, and total penetration as the hilt or handguard actually hit hard enough to bruise.