Sticky Membrane Lua

function StickyMembraneDistanceCheck( keys )
    local caster = keys.caster
    local attacker = keys.attacker
    local ability = keys.ability
    local duration = ability:GetLevelSpecialValueFor("bonus_duration", ability:GetLevel() - 1)

    local caster_location = caster:GetAbsOrigin()
    local attacker_location = attacker:GetAbsOrigin()

    local damage_pct = ability:GetLevelSpecialValueFor("bonus_damage", ability:GetLevel() - 1)/100
    local attack_damage = attacker:GetAttackDamage()
    damage_stacks = attack_damage * damage_pct

    local distance = (caster_location - attacker_location):Length2D()
    print(distance)
    local trigger_radius = ability:GetLevelSpecialValueFor("trigger_radius", (ability:GetLevel() - 1))


    if distance <= trigger_radius and not attacker:IsMagicImmune() and not attacker:IsBuilding() then
        ability:ApplyDataDrivenModifier(caster, attacker, "modifier_sticky_membrane_disarm", {})
        ability:ApplyDataDrivenModifier(attacker, caster, "modifier_sticky_membrane_bonus", {})
        local stacks = caster:GetModifierStackCount("modifier_sticky_membrane_bonus", ability)
        caster:SetModifierStackCount("modifier_sticky_membrane_bonus", ability, stacks + damage_stacks)

        local projTable = {
            Target = caster,
            Source = attacker,
            Ability = ability,
            EffectName = "particles/units/heroes/hero_rubick/rubick_spell_steal.vpcf",
            bDodgeable = false,
            bProvidesVision = false,
            iMoveSpeed = 400,
            iSourceAttachment = DOTA_PROJECTILE_ATTACHMENT_ATTACK_1,
            vSpawnOrigin = attacker:GetAbsOrigin()
        }
        ProjectileManager:CreateTrackingProjectile( projTable )

        Timers:CreateTimer(duration, function()
            local remove_stacks = caster:GetModifierStackCount("modifier_sticky_membrane_bonus", ability)
            if caster:HasModifier("modifier_sticky_membrane_bonus") then
                caster:SetModifierStackCount("modifier_sticky_membrane_bonus", ability, remove_stacks - damage_stacks)
            end
        end)
    end
end