twickenham will stage a thunderous collision between two french juggernauts in 13 days ' time , although toulon 's crusade to win an unprecedented third successive european title nearly stalled at stade velodrome on sunday .
on this faltering , unconvincing evidence , the holders of the last heineken cup face a mammoth task if they are to stop clermont auvergne from claiming the inaugural champions cup .
toulon winger bryan habana races away for a decisive try in extra-time against leinster .