Reference for Bava Kamma 234:13
ורודף שהיה רודף אחר רודף להציל ושבר כלים בין של נרדף בין של כל אדם פטור ולא מן הדין אלא שאם אי אתה אומר כן אין לך אדם שמציל את חבירו מן הרודף:
Rabbah follows his own line of reasoning, for Rabbah [elsewhere] said: If a man was pursuing another with the intention of killing him, and in his course broke utensils, whether they belonged to the pursued or to any other person, he would be exempt, for he was at that time<span class="x" onmousemove="('comment',' I.e., of threatening to endanger human life, which involves even a capital liability during the continuance of the threat; v. Ex. XXII, I, and Sanh. VIII, 7 ');"><sup>22</sup></span> incurring capital liability.<span class="x" onmousemove="('comment',' V. supra p. 680, n. 7. ');"><sup>23</sup></span>