How to make Angle Sanity Checks on a melee weapon?

[Schkr1]

So, with my Sword melee weapon, I am using client side hitboxes and already have a magnitude distance sanity check in place on the server.

I am just wonder how I could check if the the thing that was hit by the sword is in the set angle of the attacking player’s look direction.

Here is an image to describe what I am talking about.

[dthecoolest]

Oh to find the angle you can calculate the dot product angle between the humanoids look vector(humanoid root partlook vector) and the vector direction of the humanoids position towards the hitobject.