What Should I Have Called?

[umpire99]

R3 advancing home. I did tell B1 to move and in the process he got into the way of F2's throw attempting to get R3. The throw was off line and probably would not have retired the runner. I called the runner out and sent R1 & R2 back to their TOP bases. The coach wanted to know what his player was supposed to do. He said that he moved out of the way and I was rewarding the defense by making a bad throw. I told him that I didn't know if it was a bad throw or not and that he needed to drop it because it was just a JV game and his team was up 5-0. The very next pitch was in the dirt and got by the pitcher. The batter turned and sprinted to the side away from the ball. I almost tossed the little smart alec for that act.