When I watched it live, Renshaw intentionally taking Farrar to the wall looked like the worst part. Robbie McEwen covered the situation well on twitter:
http://twitter.com/mcewenrobbie
history shows that a headbutt will get dq'd from stg result (mcewen2005,Zabel 97) about 10 hours ago via web
history also shows that looking over shoulder at rival then taking them to barriers will also get u dq'd from stg results about 10 hours ago via web
(cavendish2009) about 10 hours ago via web
history will now show that combining the 2 aforementioned tactics will get u sent home...greater than the sum of it's parts about 10 hours ago via web
just an observation people about 10 hours ago via web
http://twitter.com/mcewenrobbie