Crowley looked horrified. "You enslave imps?!" So far as he knew, imps were evil elementals that were actually quite good at menial tasks, but would be more trouble than they were worth for humans. Demons could barely contain an imp's chaotic nature. Humans had no chance. So either these humans were more powerful than he knew or their imps were less so. Crowley tended not to take chances like that, so he began to treat Carrot carefully.