Immune-system components (e.g. complement) are bound to the antibodies and kept near, in reserve to disable them via phagocytosis by scavenger cells (e.g. macrophages).
Immune-system components, such as complement proteins, are associated with antibodies and held in reserve. These components can be taken up by scavenger cells like macrophages through a process called phagocytosis, thereby neutralizing them.