The maniac has defense, he survived and escaped. As for the Cop... he's most likely a Zealot. Her stats aren't described. When she dies or is healed, she isn't replaced by a Zealot. It's simple. You're defending him – you're one of them. Die.
The maniac has 75% defense and immunity to being killed. It's the beginning of the game. Are you a drug addict who wants to heal him now?
Yes, it was my inattention. But it doesn't matter, because they're both on the same team.