Final answer:
The phrases show Bud's outward calmness and internal fear, highlighting his contrasted feelings.
Step-by-step explanation:
The phrases "cool as a cucumber" and "every part of my guts was shaking" reveal that Bud has conflicting feelings. While "cool as a cucumber" implies that Bud is maintaining an outward appearance of calmness, "every part of my guts was shaking" suggests that internally, he is dealing with intense emotions or fear. Thus, these phrases highlight the contrast between his external composure and his inner turmoil.