IMHO, Sam & Renae used the express pass wisely. Sam started the roadblock at the front of the pack but seemed to take numerous attempt, all of which failed. She seemed a bit flustered (possibly also due to losing time on going what they thought was the wrong way to the RB, going back to the casino, getting a new taxi and going the exact same way - it was infact the right way) and with only two other teams left still at the RB they handed it over. Although they didn't know both remaining teams would take the penalty, it was to me, the right choice to make as it saved their butts from potential elimination.