Interesting enough i havent noticed that before.
Stylistically speaking i always thought that the medical droid that it rises its hand was meant to wake up luke.
And then i ve noticed that it was actually the multimixer/hand droid in the back. I also noticed that the arm retracts again in the close up to place the bolt on the glass.
Im sure ady already fix this but still the eye always focus on the medical droid and his arm action.
-Angel