Let a hero have CON 30, his BH is CON*5=150 and his BS is CON*6=180. This gives him a SB of 180 (=BS), for a oSB and a cSB of 18 at the head (10% of 180) and a oHB and a cHB of 10% of 150=15 at the head. If he is hit at the head with a Fist attack (Fist+1,S:3) of a STR 45 villain (Fist Damage=(45-32)/3=13/3=4, so 4 make 1d+3 damage), this will do 1d+4 of dHB (hits blunt) and 1d+7 of dSB (stun blunt) to the head. The maximum of dSB is 13 to the head, which is less than the cSB=18 of the head, so he is not stunned. The maximum dHB of the attack is 10 (6+4). If the villain rolls a 6 he does 10 dHB to the head! Since the hero has cHB 15 at the head, he must no worry. Lets look if he is bleeding: The oHB is 10*1/2(blood-*B)=5 , so 10 is more than 5. The blood-loss is 10-5=5. Sadly the villain attacked critical, for double damage, and rolls a 6, for a total of 20 dHB and 26 dSB to the head, leaving the hero with cHB -5 and cSB -8 (18-26) at the head, the hero is now bleeding 10 blood-pool each round.
What happens if the villain uses his '45 colt magnum to the head? This weapon does ``bloody'' impaling damage. The HI of the hero is HI=BH/2=150/2=75, which give him o/cHI 7 (10% of 75 rounded down) at the head. The Magnum does 4d hit-damage and +12 stun-damage (BTW the SI=BS/2=180/2=90 *10% for head so o/cSI=9). The villain does maximum critical damage! So this does 48 dHI to the head, leaving the hero with cHI -41 at the head.
We now must see if he is still alive. The cHI of -41 is 
-5
7.
So he must roll below CON/5 to stay alive. If he succeeds, we now check if the
villain has blown the head away badly. The amputation * for I is 2, so the
amputation is oHI*2 at the head, which is indeed 14 (or -14). The cHI at the
head is 7-48=-41, this is far less than -14, head blown away!
The following is played without the optional carry-over rule.
The average damage would be dHI 12 and dSI 24, which would not kill our hero (cHI 7-12=-5), but stun him, because the cSI is 180/2*10%=9-24=-21<-9. The blood-loss: He bleeds for 12(dHI)-9(oHI)*1/2(blood-loss for I-type)=8 points of blood pool every round.
Now lets take a long sword with E type of damage. The dHE of a sword is 2d+1
and the dSE 2d+6. The cHE at the head is of our hero is BH*2/3*Head=100*10%=10
and the cSE at the head is BS*2/3*Head=12. Lets see how long it takes to
chop of the head with average damage. The average dHE of the long-sword(2d6+3/2d6+8)
is 10 and so dSE is 15. Lets assume that the villain has a E damage bonus of
5 (hehe), giving him a damage of dHE 15 and dSE 20. First blow to the head:
The hero is at cHE 10-15=-5 and cSE 12-20=-8. Blood: oHE*2/3=10*2/3=6, 15-6=9
blood-loss. The Amputation for HE is oHE*1=10*1=10. So if the head is -10
HE, the head is gone, this would take one! additional blows to the head. Lets
the what happens if we do maximum double damage: This is dHE [2d+3+5(damage
bonus)]*2=2*(12+3+5)=40. So our hero is at cHE 10-40=-20. Yeah amputated.
... Lets see the SE of this attack 2*(12+8+5)=50. Leaving him with SE 12-50=-38.
The blood loss for that attack is 40-6=34. The hero is dead, because he has
lost his head (BTW he is also dead because his BP is -34 which is 30
{his BP attribute, if we assume a weight of 30})