The non-aggression principle is very clear. It is never moral to *initiate*aggression, yet defense against such aggression is *always* moral. It would in fact be completely moral to kill every guard in that prison to get Boevski out and if I had the money to spare to fund such a rescue operation I would do it without hesitation. My answer would be exactly the same if *you* were arrested for smuggling 9kgs of fried potato chips.
If violence was not used to try and prevent people from getting what they want, there would be no more violence in the trade of drugs than food.