If it was the engine running against the brake - definitely no one's coming under my disc.
Assuming it was the APU and not an engine against the brake - i would be inclined, under those circumstances, to politely ask onlookers to stay away whilst the casualty was offloaded in order to protect the privacy and dignity of the patient and to allow the crew to concentrate.
Is this a case of you being upset because you were not allowed to have a look-see?
OH