So, it's just a made-up guess of a number you threw out there, and not a tad bit more. Fair enough.
I had a feeling that was the case, since it's already been determined that the speed for motion detection with Magic Lantern is actually somewhere between 200 and 300 ms, and it's even faster with silent pictures. Translated to seconds, that's .2 to .3 secongs (and even faster with silent pictures), not .5 or "a tad bit more" per your claim.
Which is irrelevant when shooting lightning, which indicates that you know nothing about shooting lightning yet. That's okay, anyone who shoots lightning has to learn it first and before they do, they just don't know how yet.
That's just downright funny.
LOL! And that's REALLY funny!
Get back to me after you've shot some lightning by being Mr. Quick-Fingers on a remote shutter trigger with a reaction time that beats the equipment used for capturing lightning by people who actually do it.