So we got this rule for the AT-ST, as well as I can read it this rule says "While defending, if the attacker's unit leader is inside your rear arc , the attack pool gains impact 3" In effect this causes up to 3 normal hits to cause damage despite the armor rule which normally only allows crits to do damage.
This is a very elegant solution to different armor facings we know from other tabletop wargames where each facing of a vehicle usually has a different armor value (i.e. 14 front, 12 side, 10 rear) and I like it a lot. What I don't like is how the
open topped
Rebel walker doesn't have this rule
I mean the rider is exposed from all sides, it should have weak point 3: rear, side and front ^^