Yhalf Roll on the Blood Recovery Chart?

The description for claret spear mentions a something about blood cost as dependend on a roll of the blood recovery chart. I think that specifically broke physics, that in a game, in a game mechanics way. Maybe it's just like, the chart is whatever the d m thinks would would be appropriate in this case to not let him get too powerful. It's possible. The other interpretation is that this is the d ms. Yes, there's a chart, and it's back at home. And you have to go gen to june, because i really want you to face your demons. This kind of like narrative fuckery, where it's like, ok, i guess we have