Hit the middle one and always reach you final normal attack as it has the most aoe. Again just target the middle one. You can also walk around the anemo one, it will make it walk into the ice and mask one, making them grouped up
Its more about ping and fps than your luck if your fps is 30 and ping is around 160 there's very low chance that the cryo one will dash just lower your fps for magu kenki leave the abyss then come again with higher fps that's the way