User blog comment:FairyRaven/Fairy Tail Chapter 336: In Order to Live Today to the Fullest, Review and Commentary/@comment-4829046-20130621122954/@comment-7418318-20130621131320

I thought it was Motherglare that actually smashed the gate.

No idea why she would crash though.... must be some feedback from the mind controll or some similar handwaveium, since Natsu didn't hit the Dragon and neither did we see Atlas Flame do it.