I am a fan of using the presumed time out if anythign happens. My partner will always be on board with me, because I show him the brush before I lean over. If he doesn't see it, or has his back turned to me, I'll yell out Time. But no need to if my partner and I can be on the same page without having to yell it out.
Just a matter of style, although I'm pretty sure most want time to be called someway or another.
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