Spike's unlife is pretty terrible right now. Slightly less terrible now that Dru's with him again, or maybe slightly more terrible now that Dru is captured and still recovering from grievous gunshot wounds. She whimpers in her sleep like a wounded animal.
He's going to kill the slayer's bodyguard. Very slowly. Torture him to find out where the slayer is, and where his family is, and then make him watch as he tortures them to death in front of him, and then kill him. Maybe give him to Dru as a toy for a bit, and let her kill him. Yeah. That sounds good. Gonna kill him very successfully, as soon as he isn't strapped to a wall inside a government holding facility.
Suddenly, apropos of apparently nothing, a portal opens up in the floor and sucks them through.