Why did Brian almost spit the berries out?

Brian almost spit the berries out because he was initially unsure of whether they were safe to eat. His instincts were heightened after experiencing the harshness of survival in the wilderness, making him cautious about consuming unfamiliar food. The taste was unexpected, leading to a moment of hesitation before he decided to enjoy them. Ultimately, they turned out to be a delicious and energizing source of sustenance.