How do I make the A.I follow/guard a unit?

[Wayzz]

You know how in Diablo you can have companions that arent played controlled following you, and attacking things that get close? How do I basically order a certain unit to ''escort'' another one? I can obviously order it to follow, but it refuses to attack when combat happens. It just keeps following. I tried to create an event where if the unit I want to be protected, lets say Kaelthas, is attacked, then the unit who guards it, lets say the Captain, will attack the triggering unit. But he just keeps following instead. I just want him to follow when theres no action, and then when we're in combat, he'll go back to attacking.

 

[Chucky]

• Untitled Trigger 001
  • Events
    • Time - Every 2.00 seconds of game time
  • Conditions
    • (Distance between (Position of Kael 0000 <gen>) and (Position of Captain 0001 <gen>)) Greater than or equal to 500.00
  • Actions
    • Unit - Order Captain 0001 <gen> to Attack-Move To ((Position of Kael 0000 <gen>) offset by 500.00 towards (Random angle) degrees)

and if a unit attacks Kael:

• Untitled Trigger 001 Copy
  • Events
    • Unit - A unit Is attacked
  • Conditions
    • (Attacked unit) Equal to Kael 0000 <gen>
    • (Current order of Captain 0001 <gen>) Not equal to (Order(attack))
  • Actions
    • Unit - Order Captain 0001 <gen> to Attack (Attacking unit)

 

[Wayzz]

• Untitled Trigger 001
  • Events
    • Time - Every 2.00 seconds of game time
  • Conditions
    • (Distance between (Position of Kael 0000 <gen>) and (Position of Captain 0001 <gen>)) Greater than or equal to 500.00
  • Actions
    • Unit - Order Captain 0001 <gen> to Attack-Move To ((Position of Kael 0000 <gen>) offset by 500.00 towards (Random angle) degrees)

and if a unit attacks Kael:

• Untitled Trigger 001 Copy
  • Events
    • Unit - A unit Is attacked
  • Conditions
    • (Attacked unit) Equal to Kael 0000 <gen>
    • (Current order of Captain 0001 <gen>) Not equal to (Order(attack))
  • Actions
    • Unit - Order Captain 0001 <gen> to Attack (Attacking unit)

Thank you so much man!