In context, which of the following revisions is necessary in sentence 13 (reproduced below)?
Then, I simply walked around the mountain to have a look, and when I got there, I saw some elk just moving into the aspens.
Directions: The following passage is an early draft of an essay. Some parts of the passage need to be rewritten. Read the passage and select the best answer for the question that follows. In choosing the answer, follow the requirements of standard written English.
Bow Hunting
(1) He sighs in disappointment as he watches a bull run through the aspens. (2) He did everything he could; the bull didn't live that long by being stupid. (3) I never had that type of rush before, even though I had been defeated, I was hooked on bow hunting. (4) When school was ending in my sophomore year, I realized that I was going to be bow hunting that fall, and that I had better start to practice shooting. (5) I practiced shooting everyday. (6) I thought it wouldn't be too hard to get an elk; all I had to do was be able to hit it. (7) I started getting everything together on the day before season opened. (8) I was ready for the big day. (9) I was too excited to sleep that night so I just stayed up and read. (10) It was finally 4:30 in the morning when I jumped in the pickup and drove to where I was going to hunt. (11) It was still dark when I reached the mountain from where I wanted to glass, and waited for it to get light, so I could start looking for elk. (12) I glassed the slopes and openings but didn't see any elk. (13) Then, I simply walked around the mountain to have a look, and when I got there, I saw some elk just moving into the aspens. (14) I thought I could get ahead of them if I cut around a hill. (15) While passing through the aspens, I heard a bull bugle just ahead of me. (16) I set up on the trail I thought he would use, checked the wind and began to call. (17) I could hear the bull moving in my direction. (18) When he was at 40 yards, he went behind some bush and I drew my bow. (19) He came into perfect sight at 30 yards and stopped broadside. (20) I was shaking so hard that I had a hard time getting my sights to hold still for the shot. (21) I put the pin right behind his shoulder and released. (22) I watched my arrow fly towards him. (23) Then I watched in horror as my arrow whizzed over his back and lodged itself into a tree behind the bull. (24) The bull hesitated a moment before he turned and ran away through the aspens. (25)I stood in disbelief and watched him run. (26) I did everything right except I was so excited that I had put the 40 yard pin on him instead of the 30 yard pin. (27) I stayed there for about five minutes and stared at where the bull had disappeared.