So i was wondering if anyone can verify (ideally through documented splits or a video) if any runner has every run a sub 50 second last 400 meters while running under 4 minutes for the mile or the equivalent for 1500m? So just to be clear, if the end time is not sub 4 or 1500m equivalent i don't care how fast the last lap is. I ask because in a recent discussion with someone we had conflicting opinions on it. I think it has definitely happened, possibly even from Alan Webb, seeing as how his mile pr is 56.xx per lap i don't see how he or someone of his ability couldn't run 7 seconds faster for one lap especially in a race that could be 14+ seconds slower than their pr.