That's just what heroes do. They catch angered souls in bottles and then swallow them, just to see what happens.
Or maybe it's just Link that does it.
Sometimes he loses a heart, sometimes he gains a heart, or nothing happens. Perhaps it depends on whether the Poe has a weapon on hand? I don't facking know
He really needs to stop putting everything in his mouth, regardless. Slimy organisms that have been trailing their mucous in the dirt just seconds before getting drunk? Stamina fruits that sit on the ground and above sulfurous lava? Insect larvae? People's little souls? Poor Navi must have a heart attack everyday dealing with him. :I
Art- Me (and the more humanized Poe design)
Link, Poe- Nintendo
Yes, this is about the only canon-vore Link does