Ash... her former roommate. Another one who could be a linchpin in the Slayers' success. Time to try to plant some seeds of dissent there.
"Um... Buffy, right?"
She looked at the blonde, nibbling her lip and looking expertly nervous.
"No offense to you or anything... but I've known Ash for a while now... do you think we can really count on him if things get bad? I mean, he told me how he used to be evil and everything... what if he gets tempted again, or goes loopy and tries to kill everyone, even us?"