OK, first let me say I'm NOT training for Agility. This is for RH (SAR Suitability test as a sport, not to get you & your dog deployed as a real search team). There are various exercises to display your dogs willingness to work and obey commands at a distance. The tunnel with a sash at the end is one and they are to wait for you to catch up before continuing, thus the down after exiting the tunnel. The yellow tunnel is being borrowed, but the red sash end of it was given to me as they don't use those in agility anymore. Probably for the reason shown on the second run. 
