User blog comment:Belanderanime/Question about the 3 FUTURES, 10 000 dragons PLEASE HELP!!!!/@comment-84.13.159.42-20130707231158/@comment-11686498-20130707235505

thats a good question, I think Zeref may have known that and told the dragons. Or maybe the gate just opened in a Place near where the dragons were and they just smelled humans, or knew this was Zerefs doing. More logical, they saw something rare in a place that it is supposed to be near where they were and got in...!