what the refree take decision?

Roland KopCoach, Netherlands

This is what the rules say about it:

8:7 The actions listed below under c is an examples of unsportsmanlike conduct that is to be punished progressively, beginning with a warning (16:1b):
c) delaying the execution of a formal throw for the opponents, by not respecting the 3-meter distance or in some other way;

A throw-off is a formal throw!

10.4
For the throw-off at the start of each half (incl. any period of overtime), all players must be in their own half of the court.
However, for the throw-off after a goal has been scored, the opponents of the thrower are allowed to be in both halves of the
court.
In both cases, however, the opponents must be at least 3 meters away from the player taking the throw-off (15:4,15:9, 8:7c).

15:9 Except as indicated in Rules 14:8, 14:9, 15:4 2nd paragraph and
15:5 3rd paragraph, defending players who interfere with the execution of a throw for the opponents, for instance by not taking up a correct position initially or by moving into an incorrect position subsequently, shall be penalized. This applies regardless of whether it happens prior to the execution or during the execution (before the ball has left the thrower’s hand).
It also applies whether the throw was preceded by a whistle signal for the restart or not. Rule 8:7c applies, in conjunction with Rules 16:1b and 16:3d.
A throw that was negatively affected by a defender’s interference shall, in principle, be repeated.