On a character switch, you have the option for:
a) no follow occurs automatically.
b) normal follow occurs automatically.
c) strobe follow occurs automatically.

For follow options, you have normal follow and strobe follow.

Normal follow is not really a toggle, you initiate it and it lasts until it is broken by either getting stuck on something and the lead toon then moves out of range or by breaking follow with either a melee attack or movement in another direction.

Strobe is a toggle, it is essentially re-initiating follow every few seconds, in case it breaks.



If you have Strobe, you need to toggle it off before you can break follow.
Otherwise it will continue to initiate follow again and again.

Once strobe is off, or if you were just using normal follow.
Any movement key will break follow.
If you check out the "Others Jump" mapped key (in the General Keymaps), you see how to build independent slave movement.
I have an example of this in the keymap section of my guide.