Paper is a lot easier to read than a screen, even a modern 4k monitor is harder on the eyes than paper (I have no tried epaper displays). Paper also provides a lot more resolution, sometimes when the code is tricky the only sane option is to print out all 3 chains worth of that class (you can should turn that into sensible measurements via your favorite unit converted to get a sense of scale, but I think you will agree chains is the correct measure), spread it out on the floor with a pen and start reading and cross referencing things.