I do not know about IDPA, but sounds like RO interference in USPSA under rule 8.6.4. Yes, there should be some planning by the RO, but stuff happens, and that is why there are re-shoots (at least, USPSA).
Moving uprange during a course of fire is common. When we do it during a match, there are reminders to shooters (new and old) what to do. However, the RO needs to be close enough to maintain a safe environment, and to keep the timer running on every shot, so the stage needs to be designed to accommodate.
BTW, IDPA will have an "SO", not "RO".
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