The weapon in use has the same AP cost for both single and aimed shots (e.g.Their weapon skill is high enough that they would have a 99% chance to hit any target limb.They will always prefer single or burst fire, even in non-optimal situations such as: Companions seem to rarely (possibly never?) use aimed shots.By comparison when given single-shot weapons (particularly long range rifles), they'll spend every turn firing at enemies within range, only moving when enemies are out of range or behind cover.Single shots are often only used when they either don't have enough AP or ammo for burst fire. They'll often spend their first few turns charging forward before firing. If their weapon has a burst-fire option, they will vastly prefer that to anything else.During combat, their AI behaves according to the weapon they have equipped:.If given healing items such as Stimulants they will use them during combat (except the dog).During combat you can hold left mouse button on a companion to order them.Via dialogue options you can change their combat behavior or tell them to wait (except Gyulchatai).You can hold left mouse button on locked containers and doors to order a capable companion to open it.You can manually reload their weapons with no AP cost for them.
You can manually apply food & chem buffs to companions by placing the item in a weapon slot and targeting them with it or by using it within their inventory.Companions are immune to Addiction, Poisoned, and Radiation.