User blog comment:Etindel/That did NOT just happen!/@comment-96.57.215.124-20130603153134

"... It was then that Walder Frey negotiated with the Lannisters along with Roose Bolton and meticulously planned this event. ..."

Wrong on Bolton. He was there, but he did kill Rob Stark. The musicians killed him. The issue of who was actually behind the attack is still unresolved by the end of book five. I think that it was someone in King's Landing, but not necessarily but the Lannisters direct involvement. Review the episodes this season. Most everyone in King's Landing seems to speak of Rob Stark in the past tense, most especially LittleFinger and the Tyrells.