*** w88 11/1 p. 22 par. 11 When Marital Peace Is Threatened ***Extreme physical abuse is another basis for separation. Suppose an unbelieving mate often gets drunk, becomes enraged, and causes the believer physical harm. (Proverbs 23:29-35) Through prayer and by displaying the fruitage of Jehovah's spirit, the believer may be able to prevent such outbursts and make the situation endurable. But if the point is reached where the health and life of the abused mate actually are in jeopardy, separation would be allowable Scripturally. Again, congregation elders should look into charges of physical abuse when two Christians are involved in the troubled marriage, and disfellowshipping action may have to be taken.-Compare Galatians 5:19-21; Titus 1:7.
Bold is mine. Notice the abuser is an unbelieving mate. Watchtower rules are totally different when it's a jw who is the abuser.