Marko Sertic's page

That doesn't make sense, though. Without Greater Grapple, you need to establish or maintain a pin each round, and that normally costs a standard action. I think the round 1 action economy is less controversial: standard action to establish a grapple and a move action to establish a pin (as Greater Grapple specifically calls out a pin on the move action grapple check). The second round action economy, however, centers around whether, with Greater Grapple, you can maintain a pin twice in a round (thus triggering the blood drain ability). Note that while maintaining a pin twice is not necessary, I'm having a problem find anything that states you can't.

Specifically mentioned in the text of Greater Grapple is maintaining a pin. With the understanding that failing the maintain roll will set an opponent free, am I reading right that you could technically maintain a pin twice in a round? Normally you wouldn't need to, but in the case of the Vampire template's blood drain ability, the CON damage is inflicted on the establishment or maintenance of a pin (NOTE: not a grapple; so establishing the grapple does not trigger the damage). Thoughts?