Further complaining about the Wounds system below.
Let's say we have an unfortunate soul standing stock-still., an a nasty ganger with a knife wants to kill him.
He stabs the blade directly into the top of the poor fella's head and rolls maximum damage, getting to 5 on the Wound table (after standard 3 Toughness Bonus). He stabs again and once again rolls maximum damage, bringing it up to 15 on the table (5 damage after Toughness Bonus, plus the +5 modifier for hitting an already Wounded target).
The Blood Loss inflicted by this result (3) is not enough to kill someone. Our ganger is a metagaming little snot, and so he knows this. The poor fella he's stabbing is not terribly smart and has not moved.
Another stab, another devilishly good roll, and we're up to 25 on the Wound table. While Blood Loss will kill our fella now, that takes time. Our ganger wants to make this kill.
One last stab, one more maxed out damage roll, and the fella finally goes over the recorded levels on the Wound chart, dying instantly.
Dark Heresy is played at a relatively low power level at the start of a campaign. Combat should be scary. It should not take four knife wounds (at the maximum damage the dice can put out) to the unarmored skull to kill someone.
If I'm misreading any part of these rules, please correct me.