Unfortunately, it is more complicated than that. More than can readily summarized here and that is saying something. For instance, it wouldn't be that hard to describe how you could perhaps double your breahhold duration here. True story. The hard part would be to also summarize how to avoid having your new ability cause you to blackout. Posture alone can impact your tendency to blacking out, how you undertake clearance breathing on the surface, pre dive prep, and a good deal more. Proper buddying a free diver involves more than just being in the vicinity. It includes knowing your buddy for one thing, his habits but also understanding the signs of blackout while the diver is still submerged. It also includes knowing how to properly get him to the surface without inhaling water, positioning him on the surface to be revived and aiding that process in the best way possible. It goes beyond knowing this stuff, you need to be physically trained in its execution. There is a lot to know and that is a good thing, saves guesswork but it is best to seek proper training from a good outfit that specializes in this sort of thing like FII or PF. BTW, I don't have much regard for some specialty certification, merit badges or training for the sake of supporting dive commerce. Despite this I strongly recommend this course of training for a serious free diver, new or long term.