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