SCs: Frost/Fire Brand vs Sword of Swiftness?

[Tuidjy]

A quickened SC will incure twice his encumbrance, no matter whether he makes
two attacks or twenty. If he has 7 encumbrance and reinvigoration 10, he's in
trouble - he will get +4 fatigue per turn, on top of his buffing fatigue.

When you are comparing the swords, note that the Frostbrand has rather high
damage, and that the Firebrand is armourpiercing. Also, the secondary effect
often cleans the whole square, which is better than an additional attack.

As for defense, when you are surrounded by 16 enemies, it tends not to matter
that much. The last one attacks at +32... good luck parrying that one.
Body etherial, luck, mistform, even armour... those are your friends.