Clean Slate Glitch?

Cyanne suggested that when ANY scroll failed, the white scroll jumps back the slot. That's why the clean slate scroll would still recover 1 slot if i failed.

However, Cold Protection does not take any slots, and there is no chance of booming the item. Therefore, when failing, the white scroll HAS to give back the slot. This means that since Cold Protection works even if you have a +5 cape, you can hypothetically still "recover" the slot by using the white scroll...

Then you can have a +6 cape, and then a +7 cape, and then so on an infinite number of times.

"Therefore, when failing, the white scroll HAS to give back the slot."
What slot? There is no slot to give back. It would be like using a clean slate on said +5 cape; it just wouldn't do anything. That or the game would disconnect you, unable to compute the weird logic.