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From DarkAI

AI SET ENTITY CAN DUCK

This command can be used to prevent an entity from ducking whilst in automatic mode, if you do not want to handle that behaviour. The default mode is to allow ducking and an entity will occasionally duck depending on its stance and surroundings. Ducking allows an entity to hide behind half height obstacles which normally do not obstruct sight.

Syntax
AI Set Entity Can Duck Entity Number, Mode

Parameters
Entity Number, The id of the entity for which you want to set the duck mode.
Mode, Use 1 to allow the entity to duck, 0 to prevent ducking.

Return
n/a