In what way does the stranger’s answer increase the tension of the rising action? the book is called the monkeys paw just so whoever reads this knows

Because (if this is your first time reading the book) you could assume that they don't know this person, and think that he might be dangerous and there to hurt them. Or it's a phantom.

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,