The Wildcats had just scored their sixth try when spectators were told to evacuate the Princess Street Stand. The club issued a public call for an electrician and the fire brigade were summoned. Referee Ben Thaler had stopped play and, after a delay of around 10 minutes, blew for full time.
The Rugby Football League's match commissioner Tony Randerson confirmed that both coaches, Agar and Castleford's Ian Millward, agreed with the decision to end the game early, saying: "The fault appeared to be related to a floodlight. It seems the incident was not as serious as first thought but both coaches were in agreement that it was the best course of action."
The result will need to be ratified by the RFL but Wakefield captain Danny Kirmond was presented on the pitch with the Adam Watene Trophy which is competed for annual between the derby rivals.
"I think the rule from the RFL is that the result can stand if it goes past 60 minutes but it's at their discretion," Agar said.
"Myself and Ian spoke on the sideline in consultation with the match officials and everybody's safety is paramount.
"We didn't know how long it was going to be before we could get the game going again so, with seven minutes to go, we felt the sensible thing was to let the result stand, especially with four scores in it at that point."
Millward said he was happy for the result to stand.
"I felt they won fairly and squarely," he said. "Any problems with regard to stadium safety comes first.
"I was very happy to stop the game. There was no way we were going to win the game from there and we haven't taken too much time off the spectators. We think it was handled very well."