Sawyer did move he had to maintain a range of effect and it helped maintain his image the fact that it is a battlefield kind of eliminate that problem plus Dimaria probably has a MUCH larger range. The conversation is probably a distract. Here is a description of Cyborg 009's speed activated by click in a switch in a back tooth.
"His most prominent ability is the power to move at a speed so fast that everything else looks like a statue to him, this is triggered by a switch embedded in his teeth. However, he cannot touch any normal creatures such as humans in this state; the high speeds would kill or otherwise cause serious injury to the creature through air friction."
This dosn't look like decomposition the cloths would desolve and drop these seem to burst.
http://www.mangapanda.com/fairy-tail/467/9
plus
http://www.mangapanda.com/fairy-tail/472/15
Admittedly, Sherria helps your case but notice she is smiling slightly before the cloths start flying, you can click your back teeth while smiling like that. Also the arc of time would not earn her the title the War Princess/Valkyrie however controlling that split second that decides if a blow hits would.
http://www.mangapanda.com/fairy-tail/471/17
I also think she has other magic like sword/gun magic after all it looks like she has a GUNBLADE