That does make sense.
I'd probably have chosen "extralegal" but that has connotations of illegality too. Possibly more.
A discussion about semantic meanings and nobody invited me? That's what really hurts.
Unlawful: flying drones over the embassy and releasing swarms of beetles while other drones are used to startle roosting birds and herd them in that direction, whereupon they will eat the beetles, and bury Assange in a mountain of crap.
I don't care how absurdly prepared your legal system is, it doesn't have a provision saying you specifically can't do that, but they WILL find something to charge you wish if you do it.
Illegal: dropping a squad of operators in, infiltrating, and leaving with Assange bagged up on one of their shoulders, in a perfectly coordinated and executed mission which goes completely unobserved until the next morning when Assange isn't there.
Even if you don't get caught, slipping troops into the embassy of an ally to kidnap anyone is definitely prohibited by all sorts of laws and so forth.
Nonlegal: seeding a viral operation where people begin leaving a certain type of flower around the embassy for Julian, which happens to be the favorite food of a certain beetle that just entered their breeding season and explosively multiply before the starlings catch on and bury the whole place in crap.
No laws would need to be broken, no implied prohibitions violated, just letting things happen in a way that achieves a result.
Extralegal: arranging things such that an MQ-9 Reaper en route to rearm was unable to make a critical refueling stop was still able to just barely reach the refueling point safely, except a damn huge flock of starlings screwed up the flight plan, forcing a detour around a civilian flight that unfortunately caused it to run out of fuel with nowhere else to land but Assange's lap.
There are other more plausible extralegal methods, but basically it would need to be a "well shit, that sucks lads, let's clean up" rather than "so we squabblin' now I 'spose" type of outcome gone for there, but it would be a lot harder to arrange with a respected ally than it was to say, drop a squad in and pick off bin laden, which most any other nation would have wound up getting more than an "America!"...
From Pakistan and the international community.