Question

あ

赤線部分の文の構造を教えてください🙏
特にdownが分かりません。

foun
open. The day had been
rainy and wet so Barrymore saw the prints left by Sir
Charles' shoes as he had walked down the Alley. Half-
down the Alley is a gate, which leads to the moor.
There were signs that Sir Charles had stood there for
some time. Barrymore followed the footprints to the
way