I know we all thought it but I was thinking about the woodcruor of silverwood being the blood of the tree and implications on the fact that it is essentially sap mixed with actual blood of another living being.

And then I thought how Qifrey was able to draw that spell with his foot back at Romonon, and while I agree he used the ink of his sylph shoes to draw, considering the size of that sigil, the fact that he was definitely bleeding aplenty at that point, and the fact that his ass recognized Iguin's blood tampered inkpot in roundabout 0.5 seconds, plus his usual aura farming, and I thought "yeah there is no way that if this is something with some validity he does not know he could do it anytime if needed."

And I was thinking that if his inkpot broke or ran out during a confrontation and the stakes were high enough he probably would take any measures he could to protect the people he loves and make it out the confrontation alive.