Sentence 1: In the last mile of a marathon only two runners were in contention. 
 Sentence 3: One runner slipped on the ground and tripped the other 
 Sentence 4:  They both tumbled and fell on the ground 
 Sentence 5:  They rested for a few second before getting back up 
 Option 1: They began to pick up their pace and run even faster. 
 Option 2: They both got cramps and had to drop out of the race.