Nikoli was out after his head was smashed against the wall so anything that came after he wasn't aware of at all. He had a passing thought that maybe the smack hadn't been worth it but at least he hadn't backed down, even though he knew he was pretty fucked now.
The darkness was a welcomed, protection from the pain and trauma inflicted on his body. There were no dreams just darkness and no concious awareness of any handcuffs or car trunk.