The existence of a flight risk, which justifies the application of a measure restricting personal liberty, must be supported by a reasoned assessment based on specific, concrete, and indicative elements pointing to a real possibility that the requested person may abscond clandestinely. The severity of the penalty that the person would face upon surrender does not, in itself, constitute a relevant factor for this purpose. In the present case, the reasoning provided by the Court of Appeal is merely apparent, as it relied on a factor—the seriousness of the offence—which is not, per se, unequivocally indicative of a flight risk, while at the same time failing to verify the existence of elements capable of establishing the concreteness and present nature of such risk, or, conversely, its absence. As to the type of decision, the Court considers that the preferable solution is to make the annulment of the order for lack of reasoning entail the immediate release of the requested person.