I've got two of the three balls in place, the whole island clear of monsters except the Hinox. I could sneak the last ball off his snoring chest, but I decided that if after 100+ hours in the game I can't kill a mid-level Hinox even with the island's handicap, I'd be sad.
So I start to take him on, weakening him from up top of the hill with the four explosion barrels and the two boulders, using what the island's given me (important: this is where my final empty pedestal is). I get a bit worried as he walks up the path to where I am, but I remind myself I've killed plenty of these dudes. Just run under their legs to bait out the attack, then punish.
So I do just that. I run under him, he stomps, I get one set of swings in, he gets up, and I run back to repeat. Except I get caught on something behind my view. The Hinox gets closer, I get unstuck just in time to dodge the next attack, but because of my positioning he tries to grab me instead of doing the butt slam or the foot stomp.
But here's the reason I came to GAF with my story: As he reaches down for me, before I get to kill him, the final ball hanging from his necklace goes right into its spot in the pedestal and the cutscene plays, saying I cleared the island and returning my stuff to me.