function U.CanDodgeIncomingProjectile(npcBot, delaySeconds, invulnerabilitySeconds)
    local projectileSpeeds = {
        ['vengefulspirit_magic_missile'] = 1250,
        ['sniper_assassinate'] = 2500,
        ['chaos_knight_chaos_bolt'] = 1000,
        ['alchemist_unstable_concoction_throw'] = 900,
        ['sven_storm_hammer'] = 1000,
        ['skeleton_king_hellfire_blast'] = 1000
    }
    local incProj = npcBot:GetIncomingTrackingProjectiles()
    for _,p in pairs(incProj)
    do
        local projectileSpeed = projectileSpeeds[p.ability:GetName()]
        if not p.is_attack and projectileSpeed ~= nil then
            local distance = GetUnitToLocationDistance(npcBot, p.location)
            local hitTime = distance / projectileSpeed
            if hitTime > delaySeconds and hitTime < delaySeconds + invulnerabilitySeconds then
                npcBot:ActionImmediate_Chat( "Dodging: " .. p.ability:GetName() , true );
                return true;
            end
        end
    end
end

-----

    local manta=IsItemAvailable("item_manta");
    if manta~=nil and manta:IsFullyCastable()
    then
        if mutil.CanDodgeIncomingProjectile(bot, 0, 0.1)
        then
            bot:Action_UseAbility(manta);
            return;
        end
    end