[Jack glances up at the confetti, confused for a moment, but it only catches his attention for a second. Ninety-nine percent of his attention is still on Spike, as he staggers back from a shove that was far stronger than anything John could do. Another reminder that Spike is not John, and a timely one, perhaps.
He closes his mouth on the taste of copper and a moment's dissection of the sensation indicates that Spike's caught the tip of his tongue when they snapped shut. Not surprising, really, considering how far that tongue was pushing into his mouth at the time. Jack's eyes fly to Spike's as he automatically wipes his mouth with the back of his hand, not completely surprised when it comes away with a faint streak of blood on it. He stares back at Spike, with a thrill of excitement that might be related to fear, and something of a challenge in his eyes.]