Is the comma after kitchen necessary? would it make a difference if the comma was removed?

just as i was hiding the tube of toothpaste, my brother came into the kitchen, looking for food.

Read this excerpt from "birdfoot's grampa.” but, leathery hands full of wet brown life, knee deep in the summer roadside grass, he just smiled and said they have places to go to too. based on the excerpt, what will readers most likely infer about grampa? a he is accepting of his grandson’s ignorance. b he is irritated by his grandson’s impatience. c he believes he will not be able to save all the toads. d he believes his grandson should not talk back.

How can the passage best be revised to eliminate logical fallacies and improve clarity

Through actions and conflicts of force, the plot of novel is logically brought to the the turning point in the conflict