Things I would do:
Contact MD pronto. This patient's situation needs to be medically optimized and regardless of what hasn't worked so far, the physician needs to be actively involved in the situation of a violent patient.
Verbalize understanding of the director's concerns/pov, and then state that we will need to utilize the restraints until the sitter is in place AND the situation is controlled (through use of medications if necessary)
Brainstorm for any and every intervention that might reduce stimulation and/or increase pt comfort (noise, lights, soothing music, correct ambient temperature, assess for pain, thorough physical assessment looking for correctable reasons for agitation, etc., etc.)
Utilize the facility's incident reporting system - for both the fall and the fact that the restraints were removed by [Name] at [Time].
Document the events chronologically, including removal of restraints by [Name].
Report up the chain of command
Sorry you are dealing with this