It was not uncommon for a fight to end with a single powerful attack from two fighters at once.
This was a logical conclusion to the battle, given that it had already been going on for some time and both fighters were roughly equal in strength.
If the first fighter poured all his remaining strength into a final attack, the second simply couldn't ignore it. It was impossible.
Even if the second fighter was in a better position, as long as the first fighter could kill him with his final attack, the second fighter had to respond in kind to avoid death.
Sure, if the difference in strength had been significant, there would have been no need for a final attack. But in that case, the fight would have ended quickly from the start. It simply wouldn't have come down to final attacks.
Thus, when Sarka woke up and raised her head, she immediately understood what was happening here. She saw the Dark Knight and his crimson energy, and Adam with his darkness.
