Dealing With (some) Enemies

Enemy	Strategy
Thumper	They are deaf and have difficulties turning corners, you can anger them by walking into their line of sight and then loop around a corridor to stun them (if they hit a wall they get stunned for a few seconds and lose all their speed). Use a shovel to beat them to death, they take 5 hits to kill.
Coilhead	They are invulnerable, you cannot kill them, but they get stunned when they hit a wall or another object. They take a few seconds to recover, so you can run away.
Jester	They are invulnerable, you cannot kill them. When they first spot you you have 13-21 seconds till they start cranking their box. Then you have 35-40 seconds to leave the facility before they enter their chasing stage, insta-killing any player they come across. On average you have 54.5 seconds till they pop
Old Bird	They are invulnerable, you cannot kill them. They are fairly slow, but can speed up. Their rockets go in a random direction, good luck avoiding them. If they start flying up, crouch and seek shelter immediately, they are looking for players or other outdoor enemies to kill.