Fal::detach() 

\nn\t3::Fal()->detach($model, $field, $obj = NULL); 

Empties an ObjectStorage in a model or removes a single individual object from the model or an ObjectStorage. In the example, image can be an ObjectStorage or a single FileReference:

\nn\t3::Fal()->detach( $model, 'image' );
\nn\t3::Fal()->detach( $model, 'image', $singleObjToRemove );
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| @return void

Source Code 

public function detach ( $model, $field, $obj = null )
{
	$propVal = \nn\t3::Obj()->prop($model, $field);
	$isStorage = \nn\t3::Obj()->isStorage( $propVal );
	if ($isStorage) {
		foreach ($propVal->toArray() as $item) {
			if (!$obj || $obj->getUid() == $item->getUid()) {
				$propVal->detach( $item );
			}
		}
	} else if ($propVal) {
		$this->deleteSysFileReference( $propVal );
		\nn\t3::Obj()->set( $model, $field, null, false );
	}
}
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