Board Thread:General Discussion/@comment-26397825-20170730020549/@comment-26397825-20170730080547

I sorta theorise that the Schnee glyphs are super versatile in that they can absorb anything that has to do with energy/aura and adapt the properties of it - including the aura/semblances of other people if used in tangem with it. So Ruby readying her semblance while inside the gravity glyph meant that when it slingshotted her by reversing gravity, it did it faster because her semblance is based around speed and the Schnee glyphs adapt and utilise what they come into contact with.

It's why they seem so OP normally; they're basic glyphs but their adaptability plus the summons means they are the most versatile semblance and can be used fo rpretty much anything if the user thinks of it.