Hence the words "extraordinary circumstances. My point is that you can be considered to have it at all times without having to actually carry the big stick around, if it slips from your hand you can probably call it back, and most likely it takes a conscious choice on the owner's part transfer ownership, or else serious mojo to take it by force. In terms of a tool, those are all very useful traits. Granted for the purposes of your game you could rule that if it is dropped or physically taken by force the person who did so can choose (or maybe is forced) to take up the Bond, those mechanics are up for interpretation. But the point is that it is a bonded weapon that you can have with you at any time in any circumstance, barring somebody specifically taking over the Role as Blackstaff