Flame Cage and
Q: After accepting a challenge must the challenged model always
move into base contact with the enemy model that issued the
challenge? (p102)
A: If the challenged model is on his own then he must move
into base contact, as long as this does not require him to move
to a different facing of a unit he is engaged with. If the
challenged model is in a unit he must move as long as it does
not require leaving his unit. Where it is not possible for base
contact to be made then leave the models where they are and
simply assume that the two models are in base contact.

Nothing but net. A flaming net of pure love and evil.