Like others have mentioned, I like the idea of Luke's lightsaber powering down as it flies through the window with him. I don't think it is necessary to hear it, since like Imperial Fighter suggested, the wind would be quite loud in there anyhow, and it would be unlikely that you would hear it power down. But seeing it would keep in continuity with how they function, as well as help clear up confusion for some viewers regarding where it went. Just my thoughts.