Final answer:
Huck likely experienced shock, fear, and confusion upon witnessing Boggs' shooting, alongside a possible internal conflict regarding the morality of the situation.
Step-by-step explanation:
When Huck Finn witnesses Boggs carrying on and then being shot, it is likely that a plethora of emotions and thoughts raced through his mind that he does not explicitly share with the reader. Considering Huck's background and experiences, he may have felt a mixture of shock, fear, and confusion.
The Wild West was known for its lawlessness and the sudden violence might have starkly reminded Huck of the real dangers present in his world. He may have also contemplated the fragility of life and how quickly a situation can turn deadly.
Moreover, Huck could have experienced an internal conflict about the morality of the situation, considering whether justice was served or disturbed by the shooting. Being a young boy suddenly exposed to such a brutal act could have left a lasting impression on Huck.