There are times in your life when you are about to embark on a venture that may be as risky as driving your car or as pleasurable as exiting an airplane at 14,000 feet.
While these activities can become mundane quickly enough there is a point at which you are at a portal, be it a car door or the bezel around roaring hole that used to be a door on a King Air for the first time and it may cross your mind that it may also be the last unless you step backward instead of forward.
This may be a decision that you would make on your own, however, the reason that bezel is nicely flush and polished is because it's one of those many times in your life that someone has made a decision for you whether or not you think it's in your best interest. In this case, you may believe that right up until you actually exit the airplane, you can climb back in and land safely.
While ostensibly that door frame might be smooth to prevent you getting hooked up on the way out, your Jumpmaster has already made a decision about when and how you will be exiting and the point at which you touch that cool metallic coaming is the point at which the decision can slip away from your fingers just as smoothly as that nicely polished steel. While that might be obvious in hindsight, it can sorta slip yer mind when you are being hammered by propwash and partially combusted Jet A, and the next stop is 2 miles and 6 minutes away
