The Crows here will react badly to running, so you must keep walking. Halfway to the other side, take the detour to the two Gravestones.
Place the Wind Crest on the right Tombstone for it to reveal the Sun, Moon and Star Crests. Pressing the button on the back of each crest will show an indentation that will fit into the Tombstone on the left.
After all three are placed in their correct places, the left Tombstone will reveal a Colt Python Magnum.
Walk to the only other door in the area.