He can't use a leg as well to propel himself out of the water, and is weakened overall by the injury (bullet wounds aren't as mild as hollywood lets on). If he's weaker, that means that he can exert himself less before giving up and drowning, and that he'd stand less of a chance against the walkers.
You need to re-think that. Since when does lungs have to do anything with a wounded leg? Luke gets out of air first, then Bonnie gets out fine. She found the hole, while Luke didn't.
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He can't use a leg as well to propel himself out of the water, and is weakened overall by the injury (bullet wounds aren't as mild as hollywood lets on). If he's weaker, that means that he can exert himself less before giving up and drowning, and that he'd stand less of a chance against the walkers.
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At 3:07 on this video you see Kenny lying down on the hill, when he's also behind Lee.
https://www.youtube.com/watch?v=2wjP_W52f58
When in season 1 Carley only shot Andy once and didn't help again when Lee is going to be electrocuted.