Predict player movement

I am trying to position the beam so that it will predict where the player will go. This will be useful to prevent people cheesing the boss fight that i have planned.
robloxapp-20210214-1738497.wmv (1.4 MB)
also i apologize for downloading the video

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I figured it out, i just did this

player.HumanoidRootPart.Position + player.HumanoidRootPart.Velocity