This comic uses “te” in both it’s ongoing verb form and its make a request form. If you can’t tell which is which you should probably reread the last half-dozen strips. After all, repetition is how we learn.
雨 = あめ = rain
降る = ふる = to precipitate/fall
傘 = かさ = umbrella
返す かえす = to loan
断る = ことわる = to refuse
Good Bad Luck
Yellow: What!? Why?!
Blue: The last 六 umbrellas I lent you all mysteriously disappeared.
Yellow: Lose one more to me and it’ll be Lucky Sevens!
Blue: I don’t think a lucky amount of bad luck is worth much.