Misdirection and you
Lienna’s log has a very informative post Misdirection and you. I never even thought of using misdirect for corner pulls on caster mobs! My tanking life just got so much easier!
Basic strategy - tank stands around the corner, hunter misdirects onto tank, hunter shoots caster, caster runs up to corner to beat on that mean old tank. This brings the caster into easy tanking range and can separate the caster from CCed mobs or other mobs that might aggro. Alternately, hunter drops trap at the corner, caster runs up to corner to beat on tank, caster gets frozen, snaked, or burned. Either of these would work great for runners too.