Garrett moves stealthily upwards.
Erich attacks goblin 21.
Kayoshi attacks goblin 21, if it is still there. If not, he attacks goblin 16. If goblin 16 is also gone, he attacks the Champion.
If goblin 16 is still alive, but has only enough health to withstand one hit from Harold, then Harold attacks. Otherwise, he moves upwards to his maximum movement range, similar to his brother.