Router behavior in repeater/WISP mode

I have both a GL-AR750 and GL-AR300M16. I assume both behave similarly.

I was wondering, when in repeater mode - connected by wifi to the main network for internet access and a small LAN on the other side (just a couple of devices), if communication is needed between the two devices on the LAN side, it does NOT go through the main network and back again, does it?

I assume that it just routes the communication between the two devices within it’s own LAN?

The communication is between its own lan network.

Thank you for the information - much appreciated!