The signs stabbing people

Would never stab anyone: Pisces, Leo, Libra

Would stab someone in retaliation: Cancer

Yells 'I WON'T HESITATE, BITCH' first: Gemini, Taurus, Aquarius

Would stab without warning: Capricorn, Sagittarius

Would stab as a warning: Virgo, Scorpio, Aries