Forum:Ultimate nightmare vs C107

Someone please help me understand this case scenario that happened on devpro. Player A controls a face up Yubel - The Ultimate Nightmare in attack position and player B controls a Number C107: Neo Galaxy-Eyes Tachyon Dragon. On player B's turn he uses No. C107 effect and negates ultimate nightmare's effect, proceeds to the battle phase, attacks ultimate nightmare, player A receives 4500 battle damage but then ultimate nightmare's effect activates at the grave destroying Number C107 and inflicting 4500 damage. How is that possible since ultimate nightmare is no longer face up on the field? --a random regular passing through (talk • contribs) 22:47, July 12, 2015 (UTC)