Sentence 1: Yuan strolled merrily along a private bike trail he enjoyed. 
 Sentence 3: Yuan was surprised at the obstruction 
 Sentence 4:  He then recalled there'd been a tornado the previous night 
 Sentence 5:  Yuan reckoned high winds brought it down and hopped over it 
 Option 1: He almost ran smack dab into a tree across it. 
 Option 2: She almost ran smack dab into a tree across it.