How much damage does a vampire do in grapple?

[James Gibbons]

I can't figure out how vampires interact with grapple

http://paizo.com/pathfinderRPG/prd/bestiary/vampire.html

round 1
So Say the vampire has just successfully grappled a PC
- no extra effects
assume PC doesn't break grapple

round 2
the vampire can choose to pin the PC or do natural damage to the PC
- If pinned the PC takes 1d4 con damage and the vamp gets 5 temp hp
- If damaged the PC takes 1d4+4 damage plus energy drain. that's 2 negative levels which includes 10 damage to PC and 10 temp hit points for vamp
assume PC doesn't break grapple

round 3
???

now why would the vampire pin, unless on the third round the vamp does both by maintaing pin?
does the energy drain temp hp stack with it's self normally?
it wouldn't stack with the blood drain temp hp right?

[Claxon]

If the PC takes 2 con damage from blood drain that's effectively 1 hp per level. If the PC takes 4 con damage it is effectively 2 hp per level that is lost.

[James Gibbons]

But why would vampires choose that over simply damaging the PCs? Is it because the temporary HP from blood drain stacks? Is it a less good option intentionally because vampires are hard?

[Sammy T]

The vampire would pin on the second round if they want to prevent the PC from making further attacks (if they had 1h weaps) or severely hamper spellcasting.

[Lady-J]

also if they kill the pc with the blood drain ability they get a nice new minion

[Claxon]

James Gibbons wrote:

But why would vampires choose that over simply damaging the PCs? Is it because the temporary HP from blood drain stacks? Is it a less good option intentionally because vampires are hard?

Why would they bother grappling at all then or using energy drain when their regular full-attack would do more damage?

Options. The vampire has options to do things in different ways.

[Wheldrake]

And it's gotta be a lot more fun for our Dracula wannabe to drain their delicious blood, rather than simply rip out their spleen.

[mardaddy]

For high HP/high AC enemies, sometimes it is more efficient to kill by CON loss than HP damage.

[Kthanid]

In any case, not everything that's in a stat-block is meant to be used in normal combat.
Blood Drain is used to feed and create spawn, and it's not a good idea to feed while fighting, unless the enemies are weak enough. It's more for when the Vampire is one vs. one, or has snatched someone and feeds till the victim dies, making it a spawn in the safety of its own lair.

[Lady-J]

Kthanid wrote:

In any case, not everything that's in a stat-block is meant to be used in normal combat.

Blood Drain is used to feed and create spawn, and it's not a good idea to feed while fighting, unless the enemies are weak enough. It's more for when the Vampire is one vs. one, or has snatched someone and feeds till the victim dies, making it a spawn in the safety of its own lair.

it can be a pretty good intimidation factor when the pc's 1st see the bbeg and he is just draining a commoner