Elsa was catapulted into the sky by the soldier, and she adjusted her body well so she could maximize the throwing power of the ballista.
The soldier stood there and watch as Elsa's body was propelled up into the sky with the force from the ballista.
"she won't make it".
Says the soldier, when he saw that even with the push from the ballista, it still wasn't enough to help Elsa cover the distance between her and the Wyverns.
Elsa being the one in a dangerous situation, was not as panicked as the soldier is. She made use of the sword that was in her hand by folding her body, and placing the sword below her feet.
She steeled her feet on the sword, then used her hand to push the sword upward, pulling her along with it. Doing that, she was able to propel herself further and managed to cover the distance between her and the Wyverns.
In return for a flight momentum, Elsa was forced to let go of her sword, now having nothing else to rely upon but her bare hands.
