How does macbeth feel about the witches' prediction?

The witches are androgynous, first of all.  They appear to be women, yet wear beards.  Macbeth and Banquo are, if anything, confused.  Banquo is not afraid at all.  He doesn't take the weird sisters seriously, and there's no evidence of his feeling any fear. 

Macbeth, however, starts, or flinches, recoils, according to Banquo.  This is significant.  Banquo asks:

what play?

explanation:

the answer would be: it explains that at least one son must join the church

the expression ''as the tithe of his sons'' indicates how his father intended for at least one of his sons to serve the church. this phrase demonstrates that his father offered him as a last resort since none of his brothers chose to serve the church.

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