I only have one bio lol
Whatever it was, Panthalassa noticed the change as soon as it happened. Could have been very discrete, but he was used to looking at tiny things that communicated with him, the minor expressions of someone's face were nothing in comparison. Also, he had tossed his village banner aside, so that was a very strong clue. It might also have been the only clue, now that I think about it.
Anyway, Panthalassa was there when it happened. He was coming from his insect breeding grounds in the mountain range and entering the market area near the opposite shore, where his apartment was, when he saw Ulquiorra. The man was travelling incospicuously through the fishermen and storekeepers, busy in their morning affairs. The mist curled around him, cold in the dawn, yet quickly warming up, as if, with it was just waking up. Panthalassa called up to his friend, but he must have not heard.
He found it odd, but he decided to run after him. When the man reached the pier, Panthalassa finally approach him close enough for him to hear. When the man turned around, his village banner in his hand, about to be tossed, Panthalassa was strangely aware that the distance was 10 meters, Mid range, and even the mist parted in a sort of battleground over the wooden pier. Behind Ulquiorra, there was the mist covered ocean, behind Panthalassa the fish-smelly warehouses. He was expecting to greet a friend, but it all felt just like a battle.
Ulquiorra? Hey, man... where are you going?