[Luke had been at the farm the whole time, and despite having his Force potential cut, he was still more than capable of dealing with a few rabble-rousers. Rather than attempting to severely injure anyone, Luke's taken to using a cortosis staff that he'd taken as a mission reward some months before. He didn't want to kill anyone, and so refrained from using his lightsaber or blaster but he was not about to let the suddenly violent refugees kill his bantha, or wreck all the hard work that'd been done on the farm.

When others arrive, Luke is standing stoically near the edge of the farm, the end of the staff waiting in the dirt]

I'm sorry, I'm going to have to ask you refugees to leave. We're attempting to use the farm as a means to grow food, but it will not be ready for another few weeks. Trampling through the fields will disrupt the growing cycle and exasperate our food shortage.