Boss Grant also rapped Halsey for blowing the final whistle with Salomon Kalou poised to shoot.
Even though Spurs were already celebrating and Kalou's shot hit a post, Grant moaned: "We're all upset because he stopped the match when Kalou was right in front of goal. How can he decide whether it's one or two seconds more?"
Grant added: "The players were angry and I can understand that.
"The penalty was a rash decision and it wasn't even the referee's. When the ball hits a hand it doesn't mean a penalty if it's an accident."