Bloodborne: 1 hit kill on Bloodletting Beast. Cheater/Hacker GTRZS1577777777

Co-op with Random Guy and confederate GTRZS1577777777. Go to fight boss, I hit it once, GTRZS1577777777 hits it one and it dies. WTF is wrong with this game sometimes. EDIT: GTRZS1577777777 must be using a Hacked character.