With this plugin players who attack a friend (through Friends API plugin) will be punished by a strike back % attack damage to the attacker.
There is an option if you only want to punish players for attacking victim with permission.
Permissions
This plugin uses the permission system. To assign a permission, use oxide.grant <user or group> <name or steam id> <permission>. To remove a permission, use oxide.revoke <user or group> <name or steam id> <permission>.