I've always loved this particular way to perfect Pen, but by design or just a bug I'm always exploiting?

It use to be, if you would pen a scroll, you might accidently fail and destroy the scroll.

Though, these days, when I pen a scroll, if I do not pen any content on the scroll, it never has an issue to potentially be destroyed.
To eventually use as many pens as I would like, yet only one scroll/paper.

so, if you syntax: "pen scroll"
Which does not put any content on the scroll, you will gradually use up the pen and learn and eventually perfect pen.

If you do a "pen scroll a"
and then further "pen scroll" it will add a linefeed on the further pen scrolls, but you have to have content down first for that to occur. During this same phase, the scroll has the potential to have ink spilled on it/destroyed.