Jiren needs only to close and then open his eyes to attack his enemy!
Upon being hit by his glare, the opponent is frozen in mid-air and then pummeled by unseen attacks, ending with a wall-bounce.
If you hold the Punch button, you can delay the glare attack from coming out.
During this delaying state, he has massive amounts of armor and can take pretty much any attack that's thrown at him.
You can hold/delay it as long as the opponent is in an attack state.
Upon tanking projectile attacks the range on the glare attack is increased to fullscreen.