Replying to My friend is going to get jumped what should he do?

After a party last friday Person A and person B got into a fight and person B got fucked up. Now B's older brother and SEVEN of his friends who range from 17 to 23 are looking for A and my friend C (he literally didnt do anything wrong) My friend dosnt know what to do. Today they were waiting for him after school but he left early. They have guns. What should he do?? HE wants go get a gun but i dont think he should. The other option is to tell his dad who would most likely end up in jail for FUCKING UP the kids.