John - not sure if you're aware but Bavi was designed to be armed but is being tested without a payload. In fact, one of its two "arms" had to be cut-off for the bavi imaging program so as not to cause an immune effect for imaging tumors, etc. You must have seen the rat photo from a ways back with bavi honing in on the tumors...
The cancer cells and virus' have learned to mimick apoptosis to avoid detection; bavi blows the whistle!