However , the plan fails and Buffy realizes what has gone on , temporarily alienating Robin from the group .
As retribution for his mother 's murder , Robin conspires with Giles to distract Buffy and kill Spike .
The plan fails and Buffy realizes what has gone on , temporarily alienating Robin from the group .
As retribution for his mother 's murder , Robin conspires with Giles to distract Buffy and kill Spike .