"Maybe the planning thing was a bloody bust," Spike said, shrugging. "But you've got to remember that this entire city is in chaos all the ruddy time. It's going to take more than five minutes for you to toss a team together that's strong enough to even attempt to take on the likes of Glory."
Spike wasn't the one that was going to sit around defending other people before Buffy. Hell, he was usually the one to insult everyone else before he got to her. He gladly would, later on, but right now he wanted to make sure that Buffy wasn't seeing things just one way. He didn't need her attempting something like this again when he couldn't keep an eye on her.