4.3.1.6 Unlike Poppers, metal plates are not subject to calibration or calibration challenges. If a scoring metal plate has been hit but fails to fall or overturn, the Range Officer shall declare range equipment failure and order the competitor to reshoot the course of fire, after the faulty plate has been rectified.
4.3.1.6.1 A plate that has been hit more than once and falls or overturns before a Range Officer can stop the competitor, will be scored as hit and there will be no reshoot issued.
As to the squib, IMO, the RO had made the decision to stop the shooter and had begun the command so that's the end of it. Reset, reshoot.