Ah thanks. I was having a hard time finding the rules for satisfying the catch without the real books. (kicks UPS).
So weapon 2 seems fair for holy water? Seems a bit low considering a pistol does the same...
What kind of dmg do you think the handkerchief of sunlight did to Bianca?
I'm just tossing in my two cents, so ignore me if you choose.
Weapon 2 really isn't that weak. Remember that most average characters only have around 3 Stress Boxes, and even with everything a Red Court has, a base Weapon 2 is pretty powerful considering it bypasses their Toughness powers. It's one of the reasons why it is so dangerous.
As for the sunlight hanky, it states on YS304 that it counts as a Weapon: 3 attack and fulfills a Sunlight catch. It can also be used to blind, distract, or potentially incapacitate your opponents.
But to answer your question: "Enough." If Lore was used, Harry would have been dealing no less than 7 damage (Lore +4 if memory serves correctly, +3 Weapon); more than enough to cause a consequence ("Broken Flesh Mask," perhaps?) and still have damage left over.
Again, just a thought.