There's a scene in Mission Impossible: Fallout, where Ethan Hunt and August Walker skydive out of a plane. Suddenly they fly through a thunder cloud and August Walker apparently gets hit by lightning and passes out, forcing Ethan to save him by using his own oxygen tank
Though we later find out that...
...August Walker is really John Lark, the bad guy!
Therefore, did Walker really get that injury, or did he fake it? If yes, why would he fake it? And if he didn't fake it, what was the point of that part of the film anyway?