Stun

A Stun is a gameplay mechanic in Overwatch which causes the interruption of a majority of Abilities and Ultimates in the game. The ability to stun is tied to several heroes, with a majority of them having no ability to apply them.

The following is a list of stuns, and interactions between them for different Heroes.

Definition
There are plenty of different types of Crowd Control in Overwatch, but stuns are a particular type which actively interrupt certain abilities, and force the player into a temporary state of immobility. Stuns do not last for very long, ranging from less than a second, to up to 5 seconds.

Therefore, a stun must:


 * Force the enemy to cancel their current ability, or some ultimate abilities.
 * Render the enemy immobile for a period of time.
 * Prevent the enemy from activating any new attacks or abilities until the duration is over.

As such, abilities such as Doomfist's Uppercut, Lucio's Soundwave or Zarya's Graviton Surge are not considered stuns, despite forcing the enemy player to be locked in place or disrupted in some way.

Application
A stun will interrupt an enemy from attacking, using an ability, or using their ultimate. Depending on the character, it can also interrupt their passive ability, such as Genji's Cyber-Agility.

Abilities such as Mercy's Resurrect are interrupted by a stun, as they take several seconds to apply, but abilities such as Baptiste's Regeneration Burst are not interrupted, as they apply effects immediately to other players.

Objects such as Torbjorn's Turret can have stuns applied to them, and as such they will stop attacking for the duration of the stun. However, some objects such as Immortality Field will not have such effects applied to them.

Abilities which apply a stun effect
Echo is able to apply all the mentioned stun effects if she duplicates the hero, as expected.

Although Sombra's EMP and Hack both interrupt regular and ultimate abilities, it is not a stun as the enemy retains full movement control during its effects.

Ultimate Abilities interrupted by a stun
The following is a list of Ultimate Abilities that are completely cancelled by a well timed stun effect. Any ultimates not mentioned here are not cancelled by a Stun Effect. These include:


 * Transformation Ultimates, such as Bastion's Tank Configuration, Soldier 76's Tactical Visor, Winston's Primal Rage are not interrupted by a stun, but the heroes themselves will have their movements and abilities briefly paused, like a stun normally does.
 * B.O.B. will stop charging forward when stunned, and will be interrupted from shooting, but the ultimate will remain and Ashe can deploy him even if she is stunned shortly after pressing the button.
 * Objects such as Orisa's Supercharger will take damage from stuns, but not be interrupted.
 * Junkrat's Riptire can be stunned, which prevents it from detonating.
 * Symmetra's Photon Barrier is not interrupted when casting, despite not being a transformation ultimate.

Trivia

 * Upon release, Brigitte could stun enemies through barriers, enabling her to easily disable an enemy Reinhardt's shield, and render him vulnerable. This interaction has since been removed.
 * Upon release, Sigma's Accretion would scale with distance to inflict a longer stun on far away enemies. As such, it used to deal between 0.75s and 3s of stun duration. This was changed to apply a flat 0.85s stun at all ranges.