Artoo is hit by enemy fire. Note the animation within the explosion.

Suddenly gaining speed in the Death Star trench, Darth Vader sends out some blasts at Luke's slippery-from-the-target X-wing. Though not destroying the agile Rebel fighter, his vital Astro Droid R2-D2 has been badly compromised in its functions.

A cockpit shot likely filmed at ILM in the post production phase.