"39. YODA'S DEATH SEQUENCE: Yoda says, "Soon will I rest. Yes, forever sleep." Less than four minutes later -- bam! He's a goner. And what does Luke do while his beloved master lies choking and gasping for his final breaths? Well, he just sort of sits there like a doofus and watches him writhe in pain. Not that dialing 911 is an option on Dagobah, but a simple, "Hey, Master -- you okay?" would have been a nice gesture."
That's the one thing that bothered me on ROTJ: Yoda's death. He's talking to Luke, making soup, and suddenly he dies like that! He should already be on his death bed at the moment as Luke gets in, and be all like "oh no, Yoda, hang on, I'll bring help", and Yoda stops him and says something like "No, nothing can stop me from dying now"...