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If there's a chance that the communicators could fail as well, I suppose so. [Though they seem fine now, it wouldn't be the first time.
Tear looks down at her field in thought; it'd be easy for her to send some kind of signal to someone, but doing just the opposite is quite different, especially when she's not certain of what he can do. Toeing a line of her markings absently, she chews on her bottom lip for a moment before suddenly walking away over to an empty spot of pavement and kneeling down. Holding her hands out, she creates another, much smaller glyph, concentrating the fonon of light into the center of it until an orb about the size of a large marble is made, and with a slight gesture she wraps the rune around that and solidifies it into a glass like casing. Coming back over, she holds the small stone up and out to him between her thumb and forefinger]
Take this, and smash on the ground it if the barrier is down. It'll become a temporary beacon. Try to do it someplace high to make sure I can see it-- all these buildings are in the way.