Distance calculation and GetClosestEnemy seems wrong

[nutshoekey]

Your current GetClosestEnemy returns too early, it returns the first player in the list, and the distance calculation can go negative

local function GetClosestEnemy()
    local LocalOrigin = { EntityGetOrigin(EntityGetLocalPlayer()) }
    local NearestDistance, NearestEntity
    local Players = EntityGetPlayers(true)

    if #Players == 0 then
        return
    end

    for i=1, #Players do
        local Player = Players[i]

        local TargetOrigin = { EntityGetOrigin(Player) }
        local DistanceToTarget = MathHelpers.DistanceTo(LocalOrigin, TargetOrigin)

        if NearestDistance == nil or DistanceToTarget < NearestDistance then
            NearestEntity = Player
            NearestDistance = DistanceToTarget
        end

        if NearestDistance and NearestEntity then
            return NearestEntity, MathHelpers.UnitsToFeet(NearestDistance)
        end
    end

    return nil, 0
end

Here is the fixed one

local MathHelpers = {
    DistanceTo = function(from, to)
        local from = { x = from[1], y = from[2], z = from[3] }
        local to = { x = to[1], y = to[2], z = to[3] }
        local subtraction = { x = to.x - from.x, y = to.y - from.y, z = to.z - from.z }
        local result = MathSqrt((subtraction.x * subtraction.x) + (subtraction.y * subtraction.y))

        return result
    end,
    UnitsToFeet = function(units)
        local Meters = MathFloor((units * 0.0254))
    
        return MathFloor((Meters * 3.281))
    end,
    OnGround = function(entindex)
        return (BitBand(EntityGetProp(entindex, "m_fFlags"), 1) ~= 0)
    end
}

local function GetClosestEnemy()
    local LocalOrigin = { EntityGetOrigin(EntityGetLocalPlayer()) }

    local NearestDistance, NearestEntity
    local Players = EntityGetPlayers(true)

    if #Players == 0 then
        return
    end

    for i=1, #Players do
        local Player = Players[i]

        local TargetOrigin = { EntityGetOrigin(Player) }
        local DistanceToTarget = MathHelpers.DistanceTo(LocalOrigin, TargetOrigin)
        if NearestDistance == nil or DistanceToTarget < NearestDistance then
            NearestEntity = Player
            NearestDistance = DistanceToTarget
        end
    end
    if NearestDistance and NearestEntity then
        return NearestEntity, MathHelpers.UnitsToFeet(NearestDistance)
    else
        return nil, 0
    end
end