As I said, embellished. The script says, at that point:
ADF made the choice to not cut to Artoo there, even though the script does. Next anything with Luke is the Sandpeople dragging his body over near the landspeeder and dropping him to strip it. Without talking to him, I couldn't tell you whether Luke fainting is per George or his own narrative choice. Unless one is wearing constricting clothing, fainting in the face of danger isn't really a thing. In the movie we see Luke block the swing, see his rifle get broken, see the famous rocked shot of the Raider brandishing his gaffi stick, then cut to Artoo in his niche. From my earliest memories, I always took it as implied off-screen violence happening to Luke. Not him swooning. Obviously, per your viewing experience, it is a subjective thing. I inferred a blow the audience was spared seeing. You did not.
The towering creature brings down his curved, double-pointed
gaderffii -- the dreaded axe blade that has struck terror in
the heart of the local settlers. But Luke manages to block
the blow with his laser rifle, which is smashed to pieces.
The terrified farm boy scrambles backward until he is forced
to the edge of a deep crevice. The sinister Raider stands
over him with his weapon raised and lets out a horrible
shrieking laugh.