Most incidents that end up in a report began with a room. Fluorescent light that flickers, a television no one chose, a number board that does not move, chairs bolted in rows facing a counter, a child crying, no window, no clock, no idea whether the wait is ten minutes or two hours. For a person with a sensory processing difference, a brain injury, a psychiatric disability, chronic pain or a history of being trapped somewhere like this, the room is doing work against them before anyone has said a word.
Add the process on top: a form the person cannot read, a name called once from across the room, a policy that anyone who steps outside loses their place, a staff member who is visibly rushed. Now the person has no information, no control, and no way to get either. Pacing and loud speech are what people do when they have run out of other options. The behavior is a message about the design.
Prevention means designing the room and the process so that people keep information, control and a way to ask. It is not expensive. Most of it is a sign, a chair somewhere quieter, a text message when it is your turn, and a staff habit of saying what happens next.