“You know darn right well that you’re going to get out seven years from now—and when you’re 28 years old, you’re going to be flying free, even though you killed somebody,” Amabile said.

“I didn’t kill anybody,” Jiggetts responded.

After Jiggetts left the witness stand moments after that exchange, Amabile cross-examined ballistics expert Stephen Walsh, who inspected the crime scene—Kirkland’s J-entryway—on the day of the shooting and the following day. During Amabile’s questioning, Walsh said that the bullet he found embedded in the wall of the landing on the way to the entryway’s basement seemed to have been fired from above, while the bullet lodged in the door of the entryway seemed to have been fired upward. The trajectories of the two shots, Walsh confirmed, suggests a shooter who was standing on the stairs above the landing.

As Jiggetts told it, Copney fired at Cosby while standing in the doorway of an art room in the basement, rather than on the staircase. A gunman in that position would have to fire bullets which could turn corners in order to reach the door, Amabile said, comparing such a feat to a Road Runner cartoon.

“That’s fake, isn’t it?” Amabile asked Walsh. “That defies the laws of gravity and physics—that’s only in a cartoon, isn’t it?”

After a break for Patriots’ Day today, the third week of testimony in the trial will commence tomorrow.

—Xi Yu contributed reporting to this story.

—Staff writer Julie M. Zauzmer can be reached at jzauzmer@college.harvard.edu.