Right. I used to box and I'm now painfully aware of the fragility of consciousness.

If you get hit right, the ~0.25-0.5 seconds prior and after to that hit do not exist for you. They are gone. You'll never know how you were hit or what you were doing, your eyes will just change instantly from "looking ahead" to "looking to the side/up" and you'll have to adjust very quickly to this new reality, despite the fact that the transition was instantaneous for you.

One guy used to joke that if you ever said something really dumb, you'd have about 1-2 seconds to hit the person who heard it so you could continue as though it never happened. Should tell you something about the kind of person you might find at a boxing gym.