'The Brothers Grimsby' clip - "Suck and Spit"
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Suck and More Entertainment
She will suck up two to three times her weight in blood if she can finish her meal uninterrupted. When she bites you, she sticks this built-in syringe into your skin and sucks up a little of your blood. Meanwhile, her saliva flows into the wound. Your immune system makes antibodies and releases chemicals to protect you. That causes the initial swelling.