Can someone please explain these lines?

Why does yu tsun kill dr. albert at the end of borges’s “the garden of forking paths”?

Ash: are we going to the dance? kate: yes, why wouldn’t we be? ash: because jessie told me you wanted to go with him. kate: yeah, because jessie is my best friend! ash: okay well i’m you’re boyfriend kate: well we can all go together! ash: okay i guess. kate: what are you going to ware? ash: just a black suit you? kate: a purple dress. ash: oh cool, i have to go i’ll talk to you later. kate: okay katie: why did you tell ash we were going to the dance? jessie: because he does not deserve you! i do! katie: we have been best friends for years what are you talking about? jessie: exactly! we have been friends forever! i love you more than he ever will! katie: that’s crazy this needs to stop! jessie: i won’t stop until you go to the dance with me and not ash! can you translate this into asl? you so much!

Which term can be used to describe a type of climate? polar rainy sunny windy