Is informing someone that another person intends to harm him, after hearing the intention to cause harm from the latter, considered backbiting (namīmah)?

The Muslim woman ought to have forbidden her colleague from her wrongdoing and reminded her of Allah and His punishment. If she could not do so with her tongue, then with her heart. If the oppressor insisted, then she is permitted to inform the oppressed one to take precaution. This is not backbiting, but rather sincere advice. Warning the oppressed one about the oppressor is not forbidden backbiting.