Participants could only watch the battles from the Challenger Room as they could be challenged at any time. They could watch the ten battle stages through various screens placed throughout the room or through the giant window with a direct view.
Naturally, the girls wanted a first hand experience so they followed Xuefeng and Xiao Wen to the arena. They wanted to cheer for him and Xuefeng naturally agreed, knowing Liena wouldn't stop them like that. They first passed by the betting section before the entrance to the main stages and stopped.
Xuefeng needed to squeeze as much money as possible before he makes the deal with Drakos. He knew Drakos definitely didn't need so much Fate Stones and just wanted to extort him but there was nothing he could do. Even if he didn't peek on them in reality, Xuefeng couldn't be sure he wouldn't do it in the future.