The responsibility of a watchma n is to sound the warning. He is not responsible for how people respond to that warning. It is God's will that all be saved. Not everyone, however, will be saved. Those who die in unbelief will be lost forever.
Prayer is an expression of our faith.
John the Baptist has disciples and so do the Pharisees. A student is not above his teacher, nor a servant above his master. Some of those who had become disciples of Jesus were part of a large crowd of people. To some of these disciples he extends blessings. You will go hungry.