Let's go a few minutes back.
Somewhere on Mysthia, in the Chaos organization headquarters, Lord Thanos sat on his throne with an annoying face. Things had gotten bad recently; he could not find out who's the one behind what happened to their master Bahamut and to make matters worse, he lost a few numbers.
''So you mean to say that Five is dead?" Lord Thanos asked the messenger, already sweating bullets on his knees; the man was visibly afraid of his master becoming enraged and killing him on the spot because losing Five meant losing big. He was the most talented scientist after Maddog, some say he was more talented than his mentor, a lot of experiments and pills for the Black army were created by him, and there was still a lot more to do. So, obviously, losing someone valuable such as that must leave Lord Thanos furious; coupled with the recent failure to find the one behind Bahamut's anger, Lord Thanos should be so enraged that he could not control himself anymore.