 SPOILER: There was a lot of debate as to how Jenny Calendar should  die. Joss Whedon vetoed the idea of her being bitten, because he  wanted to make absolutely sure there was no chance at all of her  coming back as a vampire. When the decision was made to have Angelus  snap her neck, there was more debate, this time as to whether or not  Angelus should be wearing is human or vampire face when he does it.  It was eventually decided that he should be in full vampire mode.  Whedon thought that if he did it with his human face, it would be  too disturbing, and the audience would not want to see this person  as someone Buffy could still love.