The speed at which the force of the needle is being applied, at the time of breaking the tension of the skin and vein, could very well impact/mitigate the subsequent movement of the blood vessel.
I’m not sure why suggesting that the physics involved may be helpful for rolling veins, is apparently so ludicrous.
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u/Background_Humor5838 Jun 10 '25
If you surprise the vein, it won't have time to roll 🤣🤣🤣🤣