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The Knights lost 26-20 to the Warriors at Mt Smart Stadium in Auckland, following a golden point loss to Parramatta in round three.
Smith says his players showed great character to fight back from 14-0 down.
"I thought our boys were tremendous in that at half-time we were down 14-12, just by two, after the avalanche of possession that the opposition had," he said.
But Smith acknowledged that discipline cost his side the win.
"Any team that gives away a string of penalties finishes up in trouble."
Source: By Australian Broadcasting Corporation