While it took some time to explain, the scene actually happened within five seconds.
During this period, the penetrative blinding ray of light faded from the students eyes and when they opened their eyes, they were shocked by the scene.
Tyrion actually attacked an instructor and managed to send him flying backwards with his fist!
Naturally the recognized the supernova fist used by Tyrion as most of them had entered the second level of the Archive.
But they didn't think it was this powerful, blocking their vision for 5 seconds! In a battle between Supersoldiers, five seconds is three seconds too much in a life and death battle.
Tyrion must have at least reached the second level of the Supernova fist. Otherwise, it wouldn't possess such powerful effect.