this would be in the imperative mood. it is a category of verb forms that are used to express orders,instructions,commands or requests.
muir's use of diction creates a mood of urgency and fear. the highlighted words - difficult, difficult, force, crooked, struggling, tangled, fallen, fear, faint and hungry - come together to make you feel that the author is in danger. the imagery is clear so that it comes alive in your mind. diction can create a mood which can bring everything else together.
mark brainliest and have a great day!