Work out a plan to get an intervention operation in action – have the following numbers on standby for your use:
The national Domestic Violence helpline (if your country has it)
The local Domestic Violence shelter helpline wherever the victim/survivor is located.
The local police wherever the victim/survivor is located.
Make sure to contact all of these agencies immediately should you receive an urgent SOS from the victim/survivor or if you hear or witness the violence begin and escalate (and in many cases, it may escalate incredibly quickly).