Spike watched the girl run off. "Ya see, Xan? This is why vampires only step in to help within their Line, other vamps who have the same Sire. Anyone else, you can't trust to have your back. You, on the other hand, go off and help random strangers. What's it get you? Nothing, that's what."
Ducking under the demon's claw, Xander called out, "Could use a little help here."
Leaping off the tombstone, Spike took the demon out. "This totally proves my point. If you had just let the girl get killed, you'd be home safe and sound by now."