In multiplayer mode, if you are playing as Noxus, usually, it is only possible to freeze opponents by firing a charged Judicator blast at close range. However, it is possible to freeze opponents from almost any distance.

To do this, just charge the Judicator blast, but instead of aiming at the opponent, aim at the ground. Make sure to be facing your opponent. Then, release the blast and your opponent will freeze on the spot, no matter how far away they are.

*NOTE: This will only work if your opponent is on the same level ground as you are. Also, it will not work on Trace if he turns invisible.