I wouldn't frame it as intentionally triggering, but as Stopdog mentioned, interventions are meant to have an effect on the client or to get a reaction. Messing with someone's schedule purposely doesn't sound like an intervention and I don't think a sound therapist would do that purposely.

I wanted to comment on what Elio said-I've had 2 therapists that moved chairs as 'interventions'. Chair spacing and related interventions are mentioned in therapy books. and naturally, people may feel intruded on if the chairs are spaced too close; others may feel too distant if chairs are spaced too far away.

Similar things are written for job interviewing techniques and for other purposes in other types of business.