Photo: Courtesy of Sundance Institute Alex Gibney’s new documentary, Knife: The Attempted Murder of Salman Rushdie , premiered at Sundance yesterday, with Rushdie himself in attendance and an understandably heightened security presence around the festival screening. Such an event was bound to be emotional — the picture features blood-chilling footage of the 2022 stabbing attack that nearly killed the author and left him blind in one eye — and the audience was clearly shaken and moved by the