Goku: Oh no! What's your problem? He wasn't a threat to you anymore, he could barely even defend himself. There's no honor in that!
Frieza: It was the only way I could shut him up. He insists on babbling about that ridiculous legend. There's no such thing as a Super Saiyan!
I've watched that manga too, and recognize the scene.
Vegeta was actually shot at the left side of his chest (supposedly his heart).
This scene was so sad...! Yet, I like it xD
Very nice job