`` i do n't think i should , '' she said immediately . as i say , its just a passing thing . with that , mistress turns and leaves . it had been a while since the last push . `` no ... it was n't like i was sensing a vampire , but there was something . they looked at each other with renewed dread . i have done nothing to her mother . `` i thought he 'd changed , but apparently not . '' that was the first thing that keepers learned . 