because baal healed alexandre he then became friends and they both joined a party and soon after they baals party was challenged to a duel against the strongest party in demon high he was quick to accept this challenge as he wanted to increase alexandres battle experience and to show how truly powerful he is (baal)
they made a deal to whoever wins this challenge the loser has to obey the winner and it was accepted by the opposing team leader Lisa von drake. baal took the offensive whilst alexandre took defensive to defend their flag but Baals speed was so fast it was not possible to be seen with the naked eye so Lisa's party decided to use flame magic and destroy everything in the vicinity but that destructive force strong enough to take down a dragon king had no affect on baal rather he did not even have a scratch on him at it was at that point they new they had no chance of wining against this monster and at that time baal used a low level fire ball and destroyed the whole battlefield along with lisa's flag.
And so the request that baal made from lisa was to join his party and become team members and also friends.