Lvl 8, Dlvl 8, Human Samurai, killed by a water troll, while helpless

Not really sure what happened here. I walked through a door I had been through before. I was put to sleep in a cloud of gas. I'm pretty sure it was a chameleon though as the first thing to hit me was a baby crocodile. Hachi triggered a rolling boulder trap on us early on. He didn't make it.