Dagur

Dagur could see Morrigan struggling and decided to make his move on Rozalina. He used arcane magic to create a large stone boulder which he then set on fire and threw it at Damien. This would seem like a basic meteor style attack but he hid a little surprise inside the center of the boulder. A powerful fire spirit by the name Ifrit (Should I include a picture lol) 

Sabrina

Sabrina noticed as the girl warned Drayko not to eat the cannon ball, she was surprised that she knew it was a trap, the cannon balls may of been formed out of magic but the power that made them explode was Nen and nobody should be able to sense her Nen unless she was using Hatzu. This could mean that the girl was having an awakening. A term used to describe the moment a non Nen user discovers their Nen aura and acquires the ability to use it however it would still take most people years just to learn the basic principles of Nen after their awakening. Sabrina realized that Morrigan was having trouble against Damien. She decided she would leave Morrigan to Damien at least for now. Sabrina then turned her attention Regina. As she got ready to attack, she began to build up her Nen aura. As she did, there was a sudden increase in pressure in the arena. Everyone at this point would be able to sense Sabrina's intentions. All those who did not have magic or did not misuse the magic they do have would sense no hostility coming from her however all those who used dark magic would sense her intent to kill. Sabrina was finally about to get serious. A portal opened up beneath her as she let herself fall in, another portal opened over Regina's head, Sabrina came out head first as she lunched in for an attack, she consecrated a large amount of aura in her fist and went to punch Regina in the face. Upon contact with anything the aura in her fist would explode violently. If this hit the floor it would leave a large crater in the floor. This attack had more than enough power to kill. 

Ryuji

Ryuji decided his first target would be Bandit, he ran at then jumped towards Bandit as flames covered his fists and arms, he shouted out 'Brilliant Flames of the Fire Dragon'