I think for bow season you are OK being 75 yards from one another, but I would prefer to hunt farter apart. I'd approach the guy and discuss the situation or coordinate hunting times/dates, etc. I have often hunted with my buddy and we've been about 50 yards apart. We both have the same style, hunt smart, quietly, hardly move in the stand, etc. It's neat to watch deer come into the area and be too far away from you, but watch the action first hand as your buddy manuevers and gets a kill. Sometimes I think this is better than actually bagging one yourself!