During the retracting motion {HEAD ~ the herring} is directed towards {TAIL ~ the wider side} of the tunnel where the herring pieces contact the side to be removed from between the blades as the blades retract 
During the retracting motion { HEAD ~ the herring } is directed towards { TAIL ~ the wider side } of the tunnel where the herring pieces contact the side to be removed from between the blades as the blades retract
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH