A furious Ricky Stuart has labelled forward Corey Horsburgh’s decision to slap Dane Gagai as a “brain explosion” and Canberra’s NRL finals hopes were finally ended in a 30-24 loss to Newcastle. But the visitors challenged the decision and the bunker found that Horsburgh had slapped the Knights centre and he was sent to the sin bin in the 73rd minute. “We should have gone 26-all and there was a brain explosion. It was a f***ing brain explosion, and we lost the opportunity,” Stuart said. The Knights hit back when Young tore down the right flank and gave the ball to a running Ponga.