Slitherine

In a recent match I had a steady warband that was restricted in its movement by a fragged archer unit. I didn't think fragged units could impose ZOC restrictions because they can't attack. Am I missing something?
Notes:
The archer unit was fragged in a previous turn.
Indian Archers (4) is the fragged unit on the right flank of the warband.
I've only selected the lancers to get the message visible regarding the ZOC restriction.

In manual 12.1.1 it says
The following troops exert no ZOCs:
¡¡ Units in close combat.
¡¡ Units in square.
¡¡ Routing troops.
¡¡ Artillery.
¡¡ Baggage.
Non-light troops ignore the ZOC of light troops. Evaders, routers and pursuers
ignore ZOCs completely.
ZOC restrictions apply equally to player and AI units

It doesn't mention that fragmented unit exert no ZOC.

As melm says.

We could have gone either way on this, but the logic is that the ZOC'd unit does not actually know (for certain) that they are Fragmented.

Well, that's something I've learnt today... this makes it a good day