Do you think that the people who panic would bear some responsibility? If someone yelled fire in a movie theater that I was attending, I would at least look around and smell for it before I started flipping out trampling people.

Let's use another hypothetical just for fun. Let's say I called someone a bad name and they punched me, would I bear the legal responsibility for their lack of self control? I would think not. I would think the person who threw the punch would be charged for assault and I would be charged with nothing. If that's the case, how would that be different from the fire example? Someone spoke and someone reacted with no self control. I would think the person who reacted with no self control would bear at least some responsibility.

I think it's safe to assume it could go up to outright murder if intent could be demonstrated and someone actually died as a direct result.