So you get near the wall and cannot use the floor nailer or brad nailer to get a nail in through the tongue at an angle. I have seen advice to glue a board like this down vs trying to drill a guide hole and hand nail. For the glue types, some just fill the groove and attach the next board, some do this and glue to the floor. It doesn't seem to make sense to have a board glued to the subfloor (wood) when the rest are nailed (to allow it to move/expand). Did a quick check of other answers and it seems that nailing is the way to go, though it is more work. Make sense?