It was bad enough that Osbourne was stranded on an iceburg with a crazy polar bear, but now he’s there with a hungry and crazy polar bear.
Hallucination can happen when the body is exhausted, including hunger. I haven’t experienced this myself from lack of eating fortunately, I just get really light headed and realize I gotta munch on something right away. I’ve gotten minor hallucinations from lack of sleep and fevers before though, that’s always interesting.