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