residentevil
 rescuing  from the DYING status.

Chris rescuing Sheva from the DYING status.

The Partner Action Button is a context sensitive feature introduced in Resident Evil 5 and that is also present in Resident Evil 6, Resident Evil: Revelations and Resident Evil: Revelations 2.

In Resident Evil 5, most of the gameplay revolves around this feature, as Chris and Sheva must act together in order to progress through the game. It's featured on both single player and multiplayer modes, including The Mercenaries mini-game, Lost in Nightmares and Desperate Escape.

The player uses a single button (B on the Xbox and Circle on PlayStation) combined with the directional pad to issue orders to the partner (whether it's the AI or another player). It can also be used to ask for help, to express gratitude or even to make a compliment, depending on the context and given situation. In the multiplayer mode this feature is further expanded, allowing the players to minor-communicate with each other in-game without requiring any real voice communication.

The player and partner need to work together in some parts, and the Partner Action Button is required for those combined efforts, such as kicking down a heavy metal door, pulling switches, or freeing the partner from the enemy's grasp before they are killed. It's also used to give items in possession to the other character.

Commands and Voice Emotes

The most common actions, such as giving the player an item, entering another zone or rescue/save the partner will be displayed on-screen. Others are more subtelty and will only happen in specific contexts.

Orders

Actions

Chris assisting Sheva in a jump.

Chris assisting Sheva in a jump.

Reactions

Resident Evil 6

The red icon above a tagged enemy.

The red icon above a tagged enemy.

In addition to the above, Resident Evil 6 has a few new mechanics related to the parter action button:

Resident Evil: Revelations

Main article: Raid Mode (Revelations)

In Resident Evil: Revelations, the partner action button is partly available in Raid Mode, only the use of commands and reviving a partner are available. The only instance a partner action occurs within the campaign is when both characters need to interact with a door to get to the next area.

Resident Evil: Revelations 2

The partner action button returns in Resident Evil: Revelations 2 but in a different style than its predecessors, for instance, in single-player, there are only two options the player can use to command to their AI partner: either follow or wait. If the AI is in wait mode, they will stay put no matter how much distance the player is from them, unlike Resident Evil 6 where the AI will eventually come to the player even when told to wait. In this scenario, if the AI is too far away from the player, they will not be able to proceed to another area until the AI is called upon.

The voice line from the partner action button command will also change depending on the situation the characters are present on:

Additionally, there is no co-op action Resident Evil: Revelations 2, even if one character is grabbed, the second player cannot help them via the partner action button, however, in single-player mode, the AI can push the enemy off the player, indicating that the feature is in the game, but not doable by the player themselves.

A mechanic exclusive to Resident Evil: Revelations 2 is how the supporting character have a downed state but the main characters don't. Moira and Natalia can both get downed if they take too much damage but Claire and Barry will immediately die if so. When downed, the game will automatically change to the main character (single-player) and the partner action button (now Y on Xbox and triangle on PlayStation) must be held near the downed character in order to revive them.

In Raid Mode, commands such as Go, Wait, Come, Thanks and Sorry can be issued by using gestures, but the second player can't reply back by using the partner action button.

Further Notes

Sources