I do wonder if Agravaine is at least smart enough to realize he can't turn Arthur against Merlin, that bond is too strong for him to mess with.

It would be really fun to see him try, though. OH THE ANGST that could result! And in the end, if Arthur realized Merlin really IS the one he should trust more than anyone, that would be excellent. I thought they were heading that direction in this episode. It's that way in my head canon, now. *g*