detect a third number of shock events in {TAIL ~ response} to the shock detector operating at {HEAD ~ the increased shock threshold}; and 
detect a third number of shock events in { TAIL ~ response } to the shock detector operating at { HEAD ~ the increased shock threshold } ; and
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH