User blog comment:CNBA3/Fairy Tail 411 Review/@comment-1359322-20141201102857/@comment-9595671-20141201110706

Yeah, just like how he was drained from his Lightning-Flame Dragon mode. It'll likely be a while before Natsu can use the full potential of his Dragon Force.

Makes you wonder if Wendy will learn this seen and if Gajeel will ever even use it this century. (I mean seriously, they couldn't have had him use it when he fought Torafusa?)