Responsa for Gittin 145:8

מאי שנא רישא ומאי שנא סיפא

Our Rabbis taught: If he says, This is thy Get from to-day if I die from this illness, and the house fell on him or a serpent bit him, it is no Get. If he said, If I do not get up from this illness, and the house fell on him or a serpent bit him, it is a Get. Why is the rule different in the first case and in the second?<span class="x" onmousemove="('comment',' [The answer to the questions left unanswered here is supplied by the Jerusalem Talmud. In the first case he did not die from that illness. Whereas in the second, where the emphasis was on his 'getting up', the Get is valid since he did not after all 'get up'. Our Talmud however, did not evidently accept this distinction, seeing that in both cases the words 'from this illness' form part of the condition, and thus rejects the Baraitha. Tosaf.] ');">⁷</span>

Teshuvot Maharam