User blog comment:Omega natsu2/Chapter 371: Tartarus Arc, Part 2: Song Of The Heavenly Dragon, Predictions./@comment-3424593-20140212092748/@comment-7418318-20140212094241

Looks like Äs can use the fear in the victim to paralyze them (Rukia couldn't move her legs) and if his/her words are to be taken literally, s/he can even kill the victim with it, though it's obviously not an instant ability.

While the normal ability required a direct hit, with Vollständig Äs only needs the victim to see him/her for a moment for them to be affected.