RETCONNED: Using scrolls while invisible

There is nothing I hate worse than getting hoisted by my own petard, except perhaps to have to retroactively adjust the continuity of a session. It always leaves a bad taste in my mouth to have to fix a session after it has been played. Now, it is true enough that Robby pointed this out during play, but I had to do some reading afterwards to check my own writings on the subject before I could make a ruling. I blame the fact that Steve doesn't have WiFi and my laptop was useless to me in his basement.

There are two issues at play.

Invisibility -- an invisible character cannot see himself, cannot see other invisible creatures and certainly cannot read things that are invisible.

Scroll Use -- Casting a spell from a scroll is tantamount to reading it from a page of a spellbook. It takes the same amount of time to cast, as casting the same spell from memory.

Therefore, the Gnomes using the penned lightning bolt scrolls need (I think?) three segments and must terminate their invisibility to start the clock for reading the scrolls. Either that, or else they can cast their own lightning bolts from their own mana banks, which makes them decidedly less than the 10d6 bolts that were unleashed on y'all.

Now, unless you were close enough to go hands on with the gnomes, you wouldn't be able to hit them before they fired at you anyway, with two notable exceptions.  A specialist with a bow who has an arrow nocked can get a snap-fired shot, and Mai's magic missle can get off in a single segment an auto hit that would disrupt the spellcasting ability of the Gnome, rendering the scroll useless and erased.

Therefore, what actually happened was... (read the session notes to find out).