You are correct. In the passage I cited from _Tom Sawyer_, Tom and
Huck have just witnessed the murder of Dr. Robinson and are trying to
run to the safety of an old tannery. That is their goal. I don't know
if we are any closer to a definitive answer to Barbara Schmidt's
original question concerning the source. I am still unsatisfied by the
portion of the quote, "...they lost sight of their goal." That doesn't
seem to fit in with the passage from _Tom Sawyer_.
Barbara, when you find the source, please inform us. My curiosity is