What theme is common to the two excerpts below?
1. . his theory of running until he reached camp and the boys had one flaw in it: he lacked the endurance. several times he stumbled, and finally he tottered, crumpled up, and fell. when he tried to rise, he failed. he must sit and rest, he decided, and next time he would merely walk and keep on going. as he sat and regained his breath, he noted that he was feeling quite warm and comfortable. he was not shivering, and it even seemed that a warm glow had come to his chest and trunk. and yet, when he touched his nose or cheeks, there was no sensation. running would not thaw them out. nor would it thaw out his hands and feet. then the thought came to him that the frozen portions of his body must be extending. he tried to keep this thought down, to forget it, to think of something else; he was aware of the panicky feeling that it caused, and he was afraid of the panic. but the thought asserted itself, and persisted, until it produced a vision of his body totally frozen.
2.presently the boat also passed to the left of the correspondent with the captain clinging with one hand to the keel. he would have appeared like a man raising himself to look over a board fence, if it were not for the extraordinary gymnastics of the boat. the correspondent marvelled that the captain could still hold to it.