It's probably fairly difficult to make your spells invisible. At least, it would take probably take more effort and mana to suppress the color and turn it invisible. When fighting a tough opponent, it is probably not a smart move to expend additional mana and effort to do so. Not when a spell can usually travel fast enough to hit your opponent anyway (or force them to shield against it).
The next best move seems to be to set up a spell in a specific place, and then lure your prey into it. Chrono does this with Fate, setting up a bind spell behind him, knowing she'd fly into it when she attempted to attack him from behind. Then again, Chrono is highly skilled.
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