Board Thread:Plants vs. Zombies/@comment-26396330-20160607163528

So, I was playing this game yesterday, and something extremely weird happened. I had a group of zombies eating a wal-nut, and then promptly squashed them with a squash. They all died, except for one, which literally did the following. He puffed out his cheeks, and flailed his arms slightly, and then fell dead after around 5 seconds. What the heck happened? Does anyone have any response or has this happened before? It was funny, just wondering if it's normal. 