Simple RAW for Pathfinder Thread VI: Return of the Red Die

[kkplx]

Q4

Bleed Damage.
How does it work? According to the rules, a creature currently bleeding takes said bleed damage at the start of its turn.

a) However, the attack inflicting bleed deals "bleed damage". Is this actual damage added to the attack, or simply the "stacks" of bleed it applies to a target?
b) IF it does add to the damage inflicted by the attack, can it crit and does that crit (double "bleed" damage) carry over to the periodic damage inflicted?

Some examples of bleed sources:
- http://www.d20pfsrd.com/magic-items/...ities/wounding
- http://www.d20pfsrd.com/feats/racial...k-combat-tengu
- http://www.d20pfsrd.com/magic-items/...dletting-kukri