The man lying on the ground is still breathing - it appears he is not dead, but unconscious. The man is also rather stout for a human.
Before you can attack, the drake becomes distracted by a passing butterfly and flits along in its wake, leaving the injured farmer alone and apparently unconcerned about your group.
(You are still within about 30 ft. of the drake.)
Also, you notice that the drake's tracks go back away from the injured man into the forest.