What happen in the following cases during the third step of melee "Opponent Moves Minis" (rr 1.6.1, page 52)?

1. Unit A climbs up a building with height 1. The units leader and two troopers moved on that building, the other three troopers remain below the building with contact to it. So the vertical cohesion is correct (compare rr 1.6.1, page 10).

Now the opponents unit B moves in base contact with the unit leader of A on the top of the building and then starts a melee.

What happens with the three troopers of unit A (below the building) during the "Opponent Moves Minis"-step?

2. Same as case no. 1. But this time the Unit B attacks one of the three troopers (of unit A) below the building. Does this chance anything in regard to case no. 1?


Thanks in advance!