User blog comment:Real Godisme/Chapter 479/@comment-2214433-20160328142730/@comment-9595671-20160328162336

I bet it's like his Lightning Flame Dragon mode, but with the lightning replaced by stronger flames.

Yeah, I find Jacob's defeat believable because of his magic and how it works with his profession as an assassin. He cleared the room because in a straight out brawl, he wouldn't win.

His style, like most assassins, works around beating the enemy before he's seen, and when Lucy brought everyone back there was just too many for him to handle.