so, if the left (port) engine quit, the plane would turn left unless the pilot was on top of things and pressed the "right/starboard" rudder pedal.
Pardon me if I'm a bit naive but this wasn't a Seminole and its pilot was not a student; it was a Lear35. Therefore, I assume that its PIC is a professional pilot and qualified to command a very high performance aircraft.
If that was in fact the case, when an engine quits, whether its the left or the right, the pilot WILL be "on top of things" and the plane wont turn more than a few degrees if at all .... unless the pilot intentionally wants it to turn and makes it do so.
The fact that this airplane turned left (if it did) has nothing at all to do with which of its engines may have failed. If it turned left it did so because its pilot wanted to turn in that direction, for whatever reason.