Not that I don't trust his decision, but aside from a cop out, there isn't much that can be done aside form the very risky and bar-impossible schemes. Even if Bobo says you can't kill Serenity, how is anyone suppose to save Serenity? Both our suggestion requires that anyone can see you in your super stealth suit. That's the issue we either work out, or accept that it's not possible. The only options are a million to one chance, and they're the only ones we have.