Prince of Persia (MS-DOS) learning to speedrun with ragequit [NMG under 20min I am coming) #1/???

As prince is in general one of my first games I have played in my life, and I like to come back to it every few months to play for some time, I decided this time to make a registered speedrun, and to make it in good time (or at least under 20min).
From what I learned, the current NMG record is seeded run by higlak 17:09, however apart from that its seeded I saw that the run is very choppy and seems a little bit weird. Second place is taken by 7eraser7 with time of 17:22, and the recording is clear BUT:
I am still not sure, what are the real rules for NMG. If there is no jumping over guards, then why people jump on the lvl1 guard but just from different floor? Is it OK from other floor then? Why?
I am not trying to go for the glitched run, as I am not yet able to do the glitches, as it seems harder than non-glitched ones. Additionally, I think for the glitched run it can be just a macro to play the game, as the fights itself can be avoided to some point, or some kind of computer-aided play (maybe even the current speedrun records are computer-aided, as nobody would be able to detect that in general...)
My stress level with livesplit ON and recording ON are very high, so maybe it will take longer than I expected to do the run in under 20min. Maybe even the stress level is so high as when as too young kid for that game I was playing it.