Answer:
#1: Most likely it does so, and calls other paramedics to help the person it was on its way to go help. But usually people will stay out of its way when they hear one coming...
#2: Probably, because they usually just don't want meat, and don't have problems with things such as crackers. I doubt that they can live solely from vegetables!! It seems impossible!!
I have to say they are some quite interesting questions. Interesting to think over... :) Anyway, I hope my answers help answer yours!!