Alec Guinness’s screen time diminished in the latter movies of the original trilogy. But they still provided crucial moments in guiding Luke Skywalker on his journey. Here we see Guinness and Hamill in an intense conversation about the script in a behind-the-scenes photograph.
This was during Return of the Jedi when Luke returned to Dagobah after helping to rescue Han Solo. It’s an emotional moment because Yoda dies and then he reconnects with Obi-Wan Kenobi. This is a defining moment in the young Jedi knight’s life (via Digital Spy).