I know why he did that hair cut, I got the story from Roy's basement.
Aranas had a hat on during the tournament, and his hair is messed up under this hat, then when only 6 players remained in the tournament, and out of the blue, the tournament director told Aranas that he cannot wear that hat anymore since only 6 players remaining.
He doesn't know what to do with that hair under the hat which is messed up and very long in the front side of the head, so he decided to wrap it all up and do that just temporarily so the hair doesn't obstruct his way while shooting.
Roy said that if Aranas wanted to properly do that hair, he needed 45 mins which is alot of time that he doesn't have as he is still in the 9ball and playing game after game.