Fire (Burn)

[Meliondor]

A short question if I understood it right with burning.
If a model burns I roll 3d6+1 dice. So I roll 3 dice first and get for example a 1, a 4, and a 5.
So I would roll 11 dice total (1+4+5+1). So 11 dice and I get a lot of results. Every result over Vigor is counted, not the rest.
So I normally burn only the legs and the body, right ? Then each limbs takes damage for each dice that shows its number - the armor of this limb.

Is this correct ? So I will never burn the head for example ?

Meliondor