Why does sparks shoot out of Luke’s hand when Vader slices it off?

Why does sparks shoot out of Luke’s hand when Vader slices it off?

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Because it's a Hollywood movie and the director, Irvine Kirschner, used a practical effect that shots out sparks for the scene

dang, i thought it was a documentary

because of the light saber , idiot .

His blood super heating into plasma ?

Star Wars universe: He hit the saber
Movie production: they probably just fucked up
I'm not hating, by the way; I fucking love Star Wars.

Wrist watch

My only guess is the reasoning they had was that vaders lightsaber glanced off of lukes as his slid it down to slice his hand off. Considering the movement Vader makes as he spins the blades around to do that it seems the most likely explanation to me.
Also this.

this is what I always assumed as a kid. those fucking things don't have guards of any kind, it's bound to happen.

Small super heated pieces of flesh/ clothing material
/Thread