What does the expression “a red rag to the bull” suggest?

Does anyone read this story in 9th grade "when mr. pirzada came to dine"

Why does a coyote decide to take care of bill and if you need the story’s name it is pecos bill

Key events - what happens? what do we learn about the character in this event? or how does the event change the character? what is the author’s message in each set of events you have identified? 1.bruno and his family move from berlin to auschwitz due to the move he learns of the camp which leads to another key event. 2.bruno meets shmuel when they meet, they become friends which in turn towards the end leads to their untimely demise.