Seeing the enemy right before her, Rias simply was waiting for the enemy to make move, as she was simply standing there, in her normal attack position as she saw the person before him, shout something and following that one simple handseal. After that, directly, huge amounts of water started hitting her from high up, the water masses were large and strong, as well as very cold. The water strength, put her to her knees, as the freezing cold, didn't let her move at all. There was something amiss the freezing waters, as they were heavy and cold...And from judging those amounts must have been, she must have had a difficulty breathing and heavy feeling in the chest, also the waters, must have been gushing in her mouth too. But she could simply breath calmly. As she thought, she might have been placed under illusion. Having one of her hands in her knee. She started charging lightning chakra inside that palm. As the lightning was charged in that palm, she simply release it in her body, a light shock or surge and immediately, she came to the real world, after a light shock, as she saw the man finish one more handseal, and small pieces of rock, growing all around. Following that up quick, she simply extended one of the hands high up. creating very strong winds move all around her, which broke up all the pieces of earth, nullifying the lightning all around, but with the cost of the jutsu being destroyed as well.
Well, let us follow everything up with this as well. She said that as she was charging chakra in her lungs. Seconds later she released a giant fireball towards the person before him.