Release.

• Bots are able to avoid the enemy at a long distance.
  
  
• If a survivor notices an enemy, then the survivor will try to hide by crouching.
  
  
• If the survivor has health below full or half, he will be able to mend himself to injured or fully healed state if he does not move. If the player possessing the survivor, then he will be able to patch himself using [ATTACK1] (or the left mouse button).
  
  
• Survivors are able to warn each other about the threat.
  
  
• Survivors have stagger after falling from a great height.
  
  
• When survivors reach half their health, the survivors get a slight speed boost.