Do you remember that grade-school prank about cancer? Someone would casually mention a breakthrough scientific study proving that people whose hands were larger than their faces suffered from a rare type of cancer. When a gullible schoolchum would raise their hand to self-diagnose, bam, the perpetrator shoves the chum's hand deep into their face, and hilarity ensues. Sue would never fall for that prank -- she obviously doesn't have cancer.
All of that standing around by the swamp buggy has left Pop's face saggy and withered. His skull appears to be sloughing off the left side of his head. Undaunted by this turn of events, he opts to spend his last moments in the sentient world passive-aggressively reminding Sue of the lives that her corporate swamplust has destroyed.