I'll try my best to help
+ The revenge aspect is developed by their families feud throughout 3 generations and the men are forced into the same situation- getting stuck under the tree
- NOTE: a lot of friendships spur by the two people finding something in common between them
+ Friendship is also developed when the men consider how their friendliness will have a positive effect on the town. Friendship for the sake of their village.
+ They both must yell for help together in order for their lives to be saved. It is a weird bonding moment.
I tried my best, I hope I helped. :)