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The bow stops all abilities, so no instant transmission
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they trained in gravity. I assure you they won't need their super saiyan or powers. Just speed and strength.
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Instant... INSTANT! Meaning way before the arrow even reach goku, he's already pounding that hunter(s) maliciously
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More arrows
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You haven't seen how fast DBZ characters are have you? And I'm not even counting instant transmission on this one
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And we can use the shitty people as cannon fodder then blast quickly while they beating the absolute -blam!- of the fodder