What is the charge? I suspect felony Domestic Violence. Most misdemeanor charges won't land him in jail without a bond. If that's the case, it is definitely not 'so minor' as you stated. Even a misdemeanor charge of DV is serious.
You don't have to physically attack to be charged with DV; yelling, threatening, etc, in many states, is considered DV. He needs an attorney, and quickly.

