(c) actually reads "until it makes front edge or front corner to edge contact with closer enemy;" (my emphasis)
Again it's precise wording - so closer than what? Closer than (a) or (b) - the furthest you get to pursue is a base depth or width - (c) will let you stop at less than that, but doesn't let you go further!!
I suggest you pop down to the local school and find a handy dull 8 year old 
I refer you to mssg
http://games.groups.yahoo.com/group/DBMMlist/message/41443 in the list -
Phil states when asked which options you can use for pursuit:
> but when is it which? When is it (b) rather than (a)? Or (c) rather than
> (b)? Does the player
> choose? Do my knights stop after a base depth or do they pursue right into
> the rough?
Your choice of (a) or (b). (c) if you meet enemy first.
Phil
Note the position of the full stop - I'm pretty sure that's what I said too.
