What "fast reflexes" is will vary by person but keep in mind the average person (not necessarily the average gamer) struggles with moving the character/camera i

What "fast reflexes" is will vary by person but keep in mind the average person (not necessarily the average gamer) struggles with moving the character/camera in the way they want when things are stationary with normal physics. Now try taking that to launching a portal while flying midair, maybe even on controller. I mean I got through it fine but it would have helped make 2 player a lot easier with my dad at the time.