i need a ruling on a tech

[vcrazy17]

i need a call on a technical. directly after the game ended, literally seconds, one of the players from the winning team ran onto the court and started screaming at the referees. i wanted to call a tech but i did not know if that was possible since it was after the game had ended. i am a collegiate referee, but this was during an intramurals final that follows the same rules as the NCAA. i want to know what happens if i call the tech, carry over to the next game, or free throw shots right then. the free throw shots would have given the losing team the opportunity to tie or win since they were down only one point. what should have been done, or still can be done about the game.