What if Will doesn't use himself as bait to lure Hannibal, but he retreats, which Hannibal would expect. So Hannibal thinks he has to go after him and lure him. And then Will strikes. And I always think Hannibal the devil isn't fully explored. Hannibal hunts(stalks) people and manipulates them like a puppet master. Although he does it subtly without their awareness(Will is aware, of course), he is certainly a control freak. We rarely see him tempt them into his trap except for maybe Antony?