Feel free to go see the feedback on the WoWhead video dying laughing at the horrible story writing on most of the cinematics to come out of this entire mess.
They literally just burned another old god they have been setting up since CATACLYSM on a patch killing him with a kamehameha that I guess the supreme Titans never though of.
What we just going to leave C’thun and Yogg Sarron chilling? Better go point that Kamehameha beam at them also.