The loud "POP!" of displaced air and a flurry of wind rushing past Makenshi and Valentine from behind announced the arrival of Josie. She grinned ruefully at their backs and then past them, wondering who the target was. Not that she could see anything: Val's blast got into her immediate line of sight, which was enough to tell her that there was indeed an enemy near at hand. Considering the both of them protectors she was willing to do something she had never done before. Stand in the open of a warzone and trust her companions to protect her while she cast.
The magi shut her eyes and began to chant, so intent on the subject of her casting that there was no paying attention to the outside world. A bomb might have gone off nearby, and there she would remain unless disturbed. It was a spellcaster of her caliber's greatest weakness and their greatest strength, for it meant that more complex spells could be used quickly and efficiently.
The "blanket" effect of sound that accompanied a casting would begin almost immediately, indicating the speed with which she flew through the enchantment. Nothing other than that had occured yet, but it would.