User blog comment:Miskos3/Fairy Tail Chapter 380: Hell's Core, Review/@comment-4718355-20140411154829/@comment-7418318-20140411220904

But look at how he had those two heart attacks. First when his grand-son caused trouble and then when he fought his mentor.

If those cases are any indication (and you disregard how reality would work), I think his heart will be fine when fighting that guy.