In the Timeless Universe
In the original timeline, Harry Hawk was portraying the character Asa Trenchard on April 14, 1865. Hawk was reciting what some consider the funniest line in the play, "Don't know the manners of good society, eh? Well, I guess I know enough to turn you inside out, old gal — you sockdologizing old man-trap." when John Wilkes Booth shot President Abraham Lincoln and stabbed Major Henry Rathbone. Booth ran onto the stage with the bloodied knife and Harry Hawk ran off in terror.
In the altered timeline, Hawk gets slightly farther into the play before Garcia Flynn shoots Lincoln with a modern handgun and tries to kill General Ulysses S. Grant. Flynn jumps off the balcony onto the stage as Hawk stands there staring at him.