During a run I did last night I had this weird instance at the beginning where you first see jack outside after passing the "Accept her gift" gate. Out of all of my 30+ runs ive never had this happen nor during any run i have ever watched. Normally you cannot sprint again until jack is off screen, but during this run I was able to get a small sprint a moment after being forced into walk speed and was able to round the corner to watch Jack disappear.

Here is the highlight:

Not sure if this is a glitch or a good find. If any info is needed on my settings, what other things i may have done in that run, or a longer clip of the run to that point please let me know.

It's totally random, I've seen most of the top guys mention it a few times and can't replicate it.