Sentence 1: Dan beckoned the other boys to come over. 
 Sentence 3: The boys crowded around, making ribbiting sounds 
 Sentence 4:  Dan lost his footing and suddenly slipped 
 Sentence 5:  He fell down right on top of the frog, smashing it flat! 
 Option 1: He pointed at a frog he'd found in the river. 
 Option 2: He pointed at an eel he'd found in the river.