When you block someone then you are autoblocked from them as well. You cannot see their profile. You may be able to see journals (for example if they make it on the popular lsit) but you will not be able to reply to them. You cannot comment on any of that person's personal material such as photos or thought bubbles. However if you and the person you blocked are in a group together then you will be able to comment on one another's group posts.