ash
That pretty much covers it. Graphically...
If this is the case, you might want to have some more powerful groups on either side of the asher / ashee line - types that would be very unhappy if their respective backed runners disappeared. Enough so that they would make life difficult for the surviving party. It's not a complete solution, but it's a deterrent.
....
when the chips are down and you perceive it to be "Him or me".... "ME" usually wins out, regardless of the future consiquences.
and really, the Vamp player BETTER expect it. Simply by playing the snowflake, he is screaming "MEMEMEMEMEMMEMEMEMEMEME! <gasp> MEMEMEMEMEMEMEMEME!!!!!" so yea, the other players at the table just might go "Screw you, vampie. Hello Payday!!" at the first opportunity... or they may wait till they feel they have no choice.
And remember. about 99% of player Charcater runners (and about 80 to90% of fiction runners) are several (dozen) bricks short of a full load.... and the only reason they DON'T commit mass murder before lunch is that they can't carry that much ammo....so wasting a Vamp, collecting $75,000 and calling it a day?? very plausible.