A question about limiter

[Ken-UCD]

Hi, I'm a newbie in Go. Is the r.limiter.Take() called repeated here in r.handleHostPortSyn()? Since in the r.RunEnumeratione() there is a r.limiter.Take() already.

func (r *Runner) handleHostPortSyn(host string, port int) {
	 ...
	r.limiter.Take() 		// just delete this line, everything will be right
	r.scanner.EnqueueTCP(host, port, scan.SYN)
}

func (r *Runner) RunEnumeration() error {
...
	if r.options.Stream {
		r.scanner.State = scan.Scan
		for cidr := range r.streamChannel {
			...
			for ip := range ipStream {
				for _, port := range r.scanner.Ports {
					now := r.limiter.Take()		// I changed here to check, and the result shows the duration  is doubled
					fmt.Println("port:", port, now.Sub(prev))
					prev = now
					go func(ip string, port int) {
						if shouldUseRawPackets {
							r.RawSocketEnumeration(ip, port)
...
}