The insult that Solstice said towards the three angels made them snap. She did not think that it was really effective as it was something that Adrian told him. She did not even know if that was legit or not as she cannot absolutely verify everything that comes out of his brother's mouth.
She just let her mouth run wild as she cannot bear the things that the angels were spurting. People that tend to always run their mouths are also weak when it comes to verbal comebacks. She hit it right in the heart as Ramiel could not stand someone badmouthing their goddess.
The angel, Ramiel, suddenly boosted his body and wanted to separate Solstice' head from the rest of her body. He arrived about two feet away from Solstice and she did nit even realized that the former arrived that fast. Solstice activated a defensive skill, but it was not fast enough to completely block Ramiel's hands as she can see that it will not make it.