C-3PO såg definitivt Luke. Men jag tror att C-3PO misstänker att något är fel, för precis innan Lukas steg ut för att möta den första ordningen:
Luke turns around to C-3PO and winks broadly at the robot. And C-3PO has a confused look (for a robot anyway) on its face.
Du kan inte sakna den här scenen.
Dessutom säger @Machavity i sitt svar att
Luke deflected Kylo's lightsaber with his own.
Men jag kommer inte ihåg att i kampscenen (åtminstone vid min första visning), det jag minns ser är:
Luke emerging unscathed from all the firepower that the First Order threw at "him" and then avoiding Kylo's strikes during their face-to-face "battle". He also didn't leave any footprints on the planet's red and white salt surface while walking.
Jag undrar om det inte var så mycket ett tänkande (det skulle bara ha påverkat levande varelser), lika mycket som det var en
Projection or hologram. Which robots can see.
Uppdatering: Som påpekat i kommentarerna nedan kan tärningen vara en anomali. Men min hunch är det:
When Luke walks into the Resistance base, he doesn't make "contact" with anyone but Leia. He talks to her, kisses her lightly on the forehead, and leaves the dice from the Falcon in her hand. After Luke disappears, when Kylo searches the base, he finds the dice, which immediately disappears from his hands, leaving Kylo either frustrated or sorrowful (it's unclear which.)
Since Leia is the only person Luke comes into physical "contact" with, my suspicion is that Leia somehow understood what Luke was doing (even though she was not a Jedi, she was strong in the Force as well), or at least suspected something like C-3P0 does.
That would also explain why Leia left the dice behind, to make sure that Kylo saw it before it disappeared.