And he's using that knowledge to his advantage... better disguises, changing his MO, carefully executing his abductions.
No one else would be capable of executing the dramatic capture of my nemesis and the lovely child as well.
Why else would they want Jenn, if not because they'd seen her name written as the mate of the one creature who could prevent them from executing goals as mysterious as those of the Watchers?
The sacred college had grown especially worldly and troublesome since the time of Sixtus IV., and Leo took advantage of a plot of several of its members to poison him, not only to inflict exemplary punishments by executing one and imprisoning several others, but also to make a radical change in the college.
All this points to a temporary occupation by a race at a far higher stage of culture than any known Australians, who were certainly never capable of executing even the crude works of art described.
How would you define executing? Add your definition here.