After a while of doing this throw the knife in the air overhead and work between two or three people on getting the knife and keeping yourself from harm at the same time. Again, you need to relax your eyes and learn how you think and act in changing realities. The knife may be up or down, kicked to the side (if you have shoes on or know you will not be cut) and you have to keep yourself aligned and not dive without thinking to get the knife and get kicked in the head. Get the job done comes after keeping yourself from harm (almost always)
A good way to coordinate yourself is to have a friend throw a knife from behind you and catch it and it can be a tennis ball or anything else. A knife makes you more aware of the shape of the object and the relaxation of the hand.