The brutal act described is not just a violation of a woman; it's a complete stripping away of her identity and worth.
The verse states, 'they knew her and abused her all night until the morning.' The word 'knew' here is a euphemism for sexual violation, and the subsequent 'abused her' underscores the extreme violence and degradation. This was not a singular act, but a prolonged assault that lasted through the entire night.
Their 'knowing' and 'abusing' her signifies a total disregard for her personhood. She was reduced to an object for their base desires, her will, her pain, and her very being utterly ignored. The fact that they 'let her go' only when dawn broke suggests their actions were deeds of darkness, unable to withstand the light of day, further emphasizing the shame and depravity of their deeds.