How do you think Buffy and Rileys relationship would have been different had Spike not returned in season 4.
As Spike became closer to Buffy, Riley seemed to get further away, with Spike being the one to tell Buffy that Riley was getting bitten my vampires, would any of that happened, if Spike wasn't there?
As Spike became closer to Buffy, Riley seemed to get further away, with Spike being the one to tell Buffy that Riley was getting bitten my vampires, would any of that happened, if Spike wasn't there?