Switch System
The Switch System is Echoes of Aincrad's core companion-coordination mechanic. It is the specific term Bandai Namco uses for how the player and their NPC companion hand combat off to each other during fights.
Chaining Attacks
At its simplest, the Switch System lets the player chain attacks with their partner and change roles during a fight. One character opens a combo, the other closes it, and the pair can then rotate without the fight losing momentum.
Autonomous vs Held
The player has two modes for how the partner behaves. In autonomous mode the partner acts on its own, fighting freely alongside the player. In the held mode the player specifically holds the partner back, then triggers a coordinated attack that splits damage between the two of them for a larger combined strike. Deciding when to release the partner is one of the tactical inputs the system puts on the player.
Where It Meets the Timing System
The Switch System pairs with the game's defensive timing windows. Successful Parry Slash, Dodge Slash, and Reversal Slash all rely on the partner stepping in at the right moment, which means Switch positioning and timed parry reads drive each other in practice.