Most of the bosses in Bloodborne try to kill you with brute force and incredibly tricky attacks. The Witches of Hemwick are a little bit different. They will hide out and summon waves of shadow monsters to attack you. Ignore the minions and focus on finding the Witches. Having a torch equipped in your left hand will make this much easier. Good luck and even better hunting friends!
Bloodborne Bosses: The Witch of Hemwick Strategy