However , while filming the original pilot `` Serenity '' , PERSON@1 decided that PERSON@2 was unsuitable for the role of PERSON@3 , and shot her scenes in singles so that it would be easier to replace her .

However , while filming the original pilot `` Serenity '' , PERSON@1 saw that the actress cast as PERSON@3 -LRB- PERSON@2 -RRB- was not right for the role .
