Hi everyone. I've heard that martial artists can somehow foresee an event before it actually happens. There is a test in which the student kneels, and the teacher behind him strikes with a sword, and so the student must avoid the strike by rolling. According to the people that have passed this test, it is impossible to feel the movement of the sword with the ordinary senses because of the great speed, but they rather "sense" a great fear of being killed and then they react. Do you have any insights on how this can be done? If there is no time for them to react, how can they "know" that they have to roll over? In terms of physics, how can one interact with an environment so quickly? Thanks in advance.