Considering Vados and Whis are not just far stronger than the Hakaishin bros, but also far more skilled and in control of their abilities, I wouldn't be surprised if they were able to control their power to the level where their attacks cause no damage to anything but their opponents. Beerus already showed some level of atomisation in his ability to somewhat negate weaker Ki attacks used against him, so it could be possible for his teacher to be able to completely atomise his attacks as to only damage the intended target.