It wasn't Bell's fault.
TG even commented on that blitz in his blog, in his article about Dansby.
http://espn.go.com/blog/afceast/post/_/id/17953/karlos-dansby-hits-ground-bills-running
Bell did his job and picked up Wake. What Trent was supposed to do was recognize the possibility of a 2 on 1 blitz on his left side, and either shift the protection to that side, or find the hot-route that Dansby would have had to cover had he dropped into coverage.
Trent did neither, and got punished for it. Don't blame Bell - he actually did a decent job this game. I thought it was promising.