User blog comment:Skeith9/Heroic Spirits Speculation/@comment-4572759-20140721234938/@comment-24754018-20140722042000

Back after a short nap and  little browsing, and while I hate to seem to like I am putting too much thought into this, I suppose I am. It's a very slow day/night (early morning time -ish) here.

Flipendo  is taught in first/second year of Hogwarts. It can also be easily deflected by even basic defensive spells. It hardly compares to whatever ancient spells most Caster Servants would have access to.