Reference for Bava Kamma 180:18
פרט לכשיצתה אבן מתחת ידו של מכה פטור
Said R. Akiba to him: [Even if the instrument was placed before the judges], yet did the actual killing take place before the judges of the Court of Law that they should be expected to know how many times the murderer struck the victim, or again the part of the body upon which he struck him, whether it was upon his thigh or upon the tip of the heart? Again, supposing the murderer threw a man down from the top of a roof or from the top of a mansion house so that the victim died, would the court of law have to go to the mansion or would the mansion have to go to the court of law? Again, if the mansion meanwhile collapsed, would it be necessary to erect it anew [as it was before for the inspection of the court of law]?<span class="x" onmousemove="('comment',' [In which case the court relies on the examination made by the witnesses; v. Tosef. Sanh. XII.] ');"><sup>14</sup></span>