The patient was uninjured and transported to Hawke's Bay Hospital in a moderate condition.
Both ambulance officers have been stood down from their duties.
Hutchinson said they were being supported through what was a difficult situation.
"This is an unacceptable act on our colleagues. They have endured an horrific ordeal while on duty to help others. Assaults against paramedics and any other emergency service workers are unacceptable at any time and in any situation.
"St John takes very seriously the safety of its officers and has systems, alerts and supportive measures in place to ensure their security and wellbeing. Any abuse or assault against ambulance officers is unacceptable and will not be tolerated."
Police told the Herald the alleged offender was not located last night after leaving the scene and inquiries were ongoing.