O-sake-o nomu-to abare-dashite, te-ga tsukerarenaku-naru-n-desu. (Once he drinks alcohol, he starts acting violently and no one can stop him.)

Situation 1: In a restaurant after work, Ms. Aoyama is getting advice from senior colleague Ms. Gray about her love life.

青山:彼、ふだんはやさしいんですけど、お酒を飲むと暴れ 出して、手が付けられなくなるんです。