Kai and the two girls began to kill all the magical beasts in the perimeter without any problem. The magical beasts started going into disarray as soon as Sofia defeated the ape anyway, so there wouldn't be a need for Kai to control them and order them to leave.
According to Kai, not many magical beasts would go to Belarus after their leaders died. In fact, the majority of the beasts returned to their nest, which was deep inside Moscow.
Kai already ordered the two girls not to chase them. Their mission was to kill the magical beasts to buy time for the army to retake all three countries. And Kai didn't plan to do more than that.
Roselyn felt a bit sad that there would be potential harm that those beasts might cause, but since she had gotten stronger, she had confidence in dealing with them in the future.
Kai then led the group to take on the next few magical beasts according to their schedule.