Xel immediately grabs Iago's attention and says firmly, "Spike-san is a human-vampire chimera. I gave him one liter because he was dead on his undead feet and newly come here, and he's been told that he's had all he's getting. I would have mentioned it in private later, but apparently it wasn't enough to let Tactless-san heal his head back on straight."
He turns to Spike with a very bright and somehow very bland grin. "Spike-san, it's extremely rude to tell a person that their partner is food. You see, it sounds so much like a threat. Now, I'm sure you were merely making conversation, but please be more careful in future."